<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <title>What Counts as a Fossil?</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #ffffff;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100%;
      padding: 16px 12px;
      user-select: none;
    }

    .timeline-container {
      width: 100%;
      max-width: 620px;
      display: flex;
      flex-direction: column;
      gap: 16px;
      position: relative;
    }

    /* Cards Grid */
    .cards-row {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 10px;
      position: relative;
      z-index: 2;
    }

    .epoch-card {
      background: #f8fafc;
      border: 2px solid #e2e8f0;
      border-radius: 14px;
      padding: 14px 8px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      transition: box-shadow 0.2s ease, border-color 0.2s ease;
    }

    .epoch-card.fossil {
      background: #f0fdf4;
      border-color: #86efac;
    }

    .epoch-card.cutoff {
      background: #fefce8;
      border-color: #fde047;
    }

    .epoch-card.not-fossil {
      background: #fef2f2;
      border-color: #fca5a5;
    }

    .time-label {
      font-size: 14px;
      font-weight: 800;
      color: #1e2945;
      line-height: 1.2;
      margin-bottom: 8px;
      min-height: 34px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    .epoch-card.fossil .time-label { color: #166534; }
    .epoch-card.cutoff .time-label { color: #854d0e; }
    .epoch-card.not-fossil .time-label { color: #991b1b; }

    .visual-box {
      font-size: 38px;
      line-height: 1;
      margin: 6px 0 10px 0;
      display: flex;
      gap: 4px;
      align-items: center;
      justify-content: center;
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.08));
    }

    .status-badge {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      font-size: 13px;
      font-weight: 700;
      padding: 5px 8px;
      border-radius: 8px;
      width: 100%;
      line-height: 1.2;
    }

    .badge-fossil {
      background: #22c55e;
      color: #ffffff;
    }

    .badge-cutoff {
      background: #eab308;
      color: #ffffff;
    }

    .badge-not {
      background: #ef4444;
      color: #ffffff;
    }

    /* Timeline Bar */
    .timeline-bar-wrap {
      position: relative;
      width: 100%;
      height: 32px;
      display: flex;
      align-items: center;
    }

    .timeline-bar {
      width: 100%;
      height: 10px;
      background: linear-gradient(90deg, #22c55e 0%, #22c55e 60%, #eab308 67%, #ef4444 100%);
      border-radius: 999px;
      position: relative;
    }

    .timeline-bar::after {
      content: '';
      position: absolute;
      right: -2px;
      top: 50%;
      transform: translateY(-50%);
      border-top: 8px solid transparent;
      border-bottom: 8px solid transparent;
      border-left: 10px solid #ef4444;
    }

    /* Cutoff Marker */
    .cutoff-marker {
      position: absolute;
      left: 50%;
      top: -6px;
      transform: translateX(-50%);
      width: 4px;
      height: 22px;
      background: #ca8a04;
      border-radius: 2px;
      z-index: 3;
    }

    /* Direction label */
    .direction-label {
      display: flex;
      justify-content: space-between;
      width: 100%;
      font-size: 12px;
      font-weight: 700;
      color: #64748b;
      padding: 0 4px;
    }

    @media (max-width: 420px) {
      .time-label {
        font-size: 12px;
      }
      .visual-box {
        font-size: 30px;
      }
      .status-badge {
        font-size: 11px;
        padding: 4px 4px;
      }
    }
  </style>
</head>
<body>

  <div class="timeline-container">
    
    <div class="cards-row">
      
      <div class="epoch-card fossil">
        <div class="time-label">66+ Million<br>Years Ago</div>
        <div class="visual-box">🦖🌿</div>
        <div class="status-badge badge-fossil">
          <span>✓</span> Ancient Fossil
        </div>
      </div>

      
      <div class="epoch-card cutoff">
        <div class="time-label">10,000<br>Years Ago</div>
        <div class="visual-box">🦣🦷</div>
        <div class="status-badge badge-cutoff">
          <span>⚖</span> Cutoff Line
        </div>
      </div>

      
      <div class="epoch-card not-fossil">
        <div class="time-label">Today<br>(Modern)</div>
        <div class="visual-box">🍗🐔</div>
        <div class="status-badge badge-not">
          <span>✗</span> Too New!
        </div>
      </div>
    </div>

    
    <div class="timeline-bar-wrap">
      <div class="timeline-bar">
        <div class="cutoff-marker"></div>
      </div>
    </div>

    
    <div class="direction-label">
      <span>← Deep Past</span>
      <span>Time Moving Forward →</span>
      <span>Present</span>
    </div>
  </div>

</body>
</html>

What Is a Fossil?

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      width: 100%;
      min-height: 100%;
      font-family: system-ui, -apple-system, sans-serif;
      color: #1e2945;
      background: transparent;
      padding: 12px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
    }

    .cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 12px;
      width: 100%;
      max-width: 640px;
    }

    @media (max-width: 480px) {
      .cards-grid {
        grid-template-columns: 1fr;
        gap: 10px;
      }
    }

    .fossil-card {
      border-radius: 16px;
      padding: 14px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      cursor: pointer;
      user-select: none;
      box-shadow: 0 3px 8px rgba(30, 41, 69, 0.06);
      border: 2px solid transparent;
      transition: box-shadow 0.25s ease, border-color 0.25s ease;
    }

    .fossil-card:active,
    .fossil-card.selected {
      border-color: #22b7ff;
      box-shadow: 0 6px 14px rgba(34, 183, 255, 0.2);
    }

    .card-body {
      background-color: #e8f4f8;
    }

    .card-impression {
      background-color: #fdf6e2;
    }

    .card-trace {
      background-color: #f3e8ff;
    }

    .art-container {
      width: 100%;
      height: 96px;
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 8px;
    }

    .art-container svg {
      width: 100%;
      height: 100%;
      max-height: 90px;
    }

    .title {
      font-size: 15px;
      font-weight: 700;
      line-height: 1.2;
      color: #1e2945;
      margin-bottom: 4px;
    }

    .caption {
      font-size: 12px;
      font-weight: 500;
      color: #55627a;
      line-height: 1.2;
    }
  </style>
</head>
<body>
  <div class="cards-grid">
    
    <div class="fossil-card card-body selected" onclick="selectCard(this)">
      <div class="art-container">
        <svg viewBox="0 0 100 80" fill="none" xmlns="http://www.w3.org/2000/svg">
          
          <g transform="translate(18, 40)">
            <ellipse cx="0" cy="0" rx="22" ry="22" fill="#d4a373"/>
            <ellipse cx="-2" cy="-1" rx="17" ry="17" fill="#e8c89b"/>
            <ellipse cx="-1" cy="1" rx="12" ry="12" fill="#d4a373"/>
            <ellipse cx="1" cy="0" rx="7" ry="7" fill="#e8c89b"/>
            <circle cx="1" cy="0" r="3" fill="#a2693c"/>
            
            <path d="M-18 -8 Q-12 -16 0 -22 M-8 18 Q-2 14 6 12 M-20 6 Q-14 4 -6 2 M8 -18 Q14 -10 18 0 M-14 -16 Q-6 -8 0 0" stroke="#b07d50" stroke-width="1.8" stroke-linecap="round"/>
          </g>
          
          <g transform="translate(68, 40) rotate(-28)">
            <rect x="-16" y="-4.5" width="32" height="9" rx="4.5" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5"/>
            
            <circle cx="-16" cy="-5" r="5" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5"/>
            <circle cx="-16" cy="5" r="5" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5"/>
            
            <circle cx="16" cy="-5" r="5" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5"/>
            <circle cx="16" cy="5" r="5" fill="#f8fafc" stroke="#cbd5e1" stroke-width="1.5"/>
            
            <rect x="-15" y="-4" width="30" height="8" rx="4" fill="#f8fafc"/>
          </g>
        </svg>
      </div>
      <div class="title">Body Fossil</div>
      <div class="caption">Bones & Shells</div>
    </div>

    
    <div class="fossil-card card-impression" onclick="selectCard(this)">
      <div class="art-container">
        <svg viewBox="0 0 100 80" fill="none" xmlns="http://www.w3.org/2000/svg">
          
          <polygon points="12,18 84,12 92,64 18,70" fill="#cbd5e1" rx="6"/>
          <polygon points="10,20 82,14 90,62 16,68" fill="#94a3b8"/>
          
          <g transform="translate(48, 42) rotate(18)">
            
            <path d="M-22 0 C-16 -16 12 -16 22 0 C12 16 -16 16 -22 0 Z" fill="#64748b"/>
            
            <path d="M-26 0 L24 0" stroke="#475569" stroke-width="1.8" stroke-linecap="round"/>
            
            <path d="M-10 0 L-4 -8 M-2 0 L5 -8 M6 0 L13 -6 M-10 0 L-4 8 M-2 0 L5 8 M6 0 L13 6" stroke="#475569" stroke-width="1.4" stroke-linecap="round"/>
          </g>
        </svg>
      </div>
      <div class="title">Impression</div>
      <div class="caption">Leaf Imprint</div>
    </div>

    
    <div class="fossil-card card-trace" onclick="selectCard(this)">
      <div class="art-container">
        <svg viewBox="0 0 100 80" fill="none" xmlns="http://www.w3.org/2000/svg">
          
          <path d="M12 20 C28 14, 70 12, 88 22 C92 42, 90 60, 84 68 C64 74, 30 72, 14 64 C8 48, 8 32, 12 20 Z" fill="#bcaaa4"/>
          
          <g transform="translate(42, 48) scale(0.9) rotate(-15)">
            
            <ellipse cx="0" cy="8" rx="8" ry="6" fill="#8d6e63"/>
            
            <path d="M-4 6 L-2 -18 L2 -18 L4 6 Z" fill="#8d6e63"/>
            <polygon points="0,-22 -3,-17 3,-17" fill="#8d6e63"/>
            
            <path d="M-2 6 L-16 -6 L-13 -9 L2 4 Z" fill="#8d6e63"/>
            
            <path d="M2 6 L16 -6 L13 -9 L-2 4 Z" fill="#8d6e63"/>
          </g>
          
          <g transform="translate(68, 28) scale(0.65) rotate(-10)">
            <ellipse cx="0" cy="8" rx="8" ry="6" fill="#8d6e63"/>
            <path d="M-4 6 L-2 -18 L2 -18 L4 6 Z" fill="#8d6e63"/>
            <polygon points="0,-22 -3,-17 3,-17" fill="#8d6e63"/>
            <path d="M-2 6 L-16 -6 L-13 -9 L2 4 Z" fill="#8d6e63"/>
            <path d="M2 6 L16 -6 L13 -9 L-2 4 Z" fill="#8d6e63"/>
          </g>
        </svg>
      </div>
      <div class="title">Trace Fossil</div>
      <div class="caption">Footprint Tracks</div>
    </div>
  </div>

  <script>
    function selectCard(element) {
      document.querySelectorAll('.fossil-card').forEach(card => {
        card.classList.remove('selected');
      });
      element.classList.add('selected');
    }
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      background: #f8fafc;
      color: #1e2945;
      padding: 12px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      min-height: 100%;
    }

    .header-text {
      text-align: center;
      font-size: 15px;
      font-weight: 700;
      color: #475569;
      letter-spacing: 0.5px;
      text-transform: uppercase;
    }

    .grid-container {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      width: 100%;
      flex: 1;
    }

    @media (max-width: 520px) {
      .grid-container {
        grid-template-columns: 1fr;
        gap: 8px;
      }
    }

    .fossil-card {
      background: #ffffff;
      border: 2px solid #e2e8f0;
      border-radius: 14px;
      padding: 12px 10px;
      display: flex;
      flex-direction: column;
      align-items: center;
      text-align: center;
      cursor: pointer;
      transition: border-color 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease;
      user-select: none;
      position: relative;
    }

    .fossil-card:active {
      background: #f1f5f9;
    }

    .fossil-card.selected {
      border-color: #22b7ff;
      box-shadow: 0 0 0 3px rgba(34, 183, 255, 0.25);
    }

    .badge {
      display: inline-block;
      font-size: 13px;
      font-weight: 800;
      padding: 4px 10px;
      border-radius: 20px;
      margin-bottom: 10px;
      letter-spacing: 0.2px;
    }

    .badge-body {
      background: #fef3c7;
      color: #b45309;
    }

    .badge-impression {
      background: #e0e7ff;
      color: #4338ca;
    }

    .badge-trace {
      background: #dcfce7;
      color: #15803d;
    }

    .icon-display {
      width: 100%;
      height: 72px;
      background: #f8fafc;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 12px;
      font-size: 32px;
      margin-bottom: 10px;
      border: 1px dashed #cbd5e1;
    }

    .card-caption {
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      line-height: 1.35;
      margin-bottom: 8px;
    }

    .example-tag {
      font-size: 11px;
      color: #64748b;
      background: #f1f5f9;
      padding: 3px 8px;
      border-radius: 6px;
      font-weight: 500;
    }

    .detail-bar {
      background: #ffffff;
      border: 1.5px solid #cbd5e1;
      border-radius: 10px;
      padding: 10px 14px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 8px;
      font-size: 13px;
      font-weight: 600;
      color: #1e2945;
    }

    .detail-bar span.highlight {
      color: #0284c7;
      font-weight: 700;
    }
  </style>
</head>
<body>

  <div class="header-text">3 Main Types of Fossils</div>

  <div class="grid-container" id="cardGrid">
    
    <div class="fossil-card selected" data-type="body" onclick="selectCard(0)">
      <span class="badge badge-body">Body Fossil</span>
      <div class="icon-display">
        <span title="Dinosaur Skull">🦖</span>
        <span title="Ammonite Shell">🐚</span>
      </div>
      <div class="card-caption">The actual preserved<br>body parts</div>
      <div class="example-tag">Bones • Shells • Teeth</div>
    </div>

    
    <div class="fossil-card" data-type="impression" onclick="selectCard(1)">
      <span class="badge badge-impression">Impression</span>
      <div class="icon-display">
        <span title="Fern Leaf">🌿</span>
        <span title="Jellyfish Print">🪼</span>
      </div>
      <div class="card-caption">The shape stamped<br>into rock</div>
      <div class="example-tag">Leaf prints • Outlines</div>
    </div>

    
    <div class="fossil-card" data-type="trace" onclick="selectCard(2)">
      <span class="badge badge-trace">Trace Fossil</span>
      <div class="icon-display">
        <span title="Trackways">🐾</span>
        <span title="Worm Burrow">🕳️</span>
      </div>
      <div class="card-caption">Signs the animal<br>was there</div>
      <div class="example-tag">Footprints • Burrows</div>
    </div>
  </div>

  <div class="detail-bar" id="detailBar">
    <span id="detailText">🦖 <b>Body fossils</b> are real parts of ancient creatures turned to stone.</span>
  </div>

  <script>
    const cardData = [
      {
        icon: '🦖',
        title: 'Body fossils',
        desc: 'are real parts of ancient creatures turned to stone.'
      },
      {
        icon: '🌿',
        title: 'Impression fossils',
        desc: 'are marks left behind when soft shapes pressed into mud.'
      },
      {
        icon: '🐾',
        title: 'Trace fossils',
        desc: 'show where an animal walked, dug, or fed.'
      }
    ];

    const cards = document.querySelectorAll('.fossil-card');
    const detailText = document.getElementById('detailText');

    function selectCard(index) {
      cards.forEach((card, idx) => {
        if (idx === index) {
          card.classList.add('selected');
        } else {
          card.classList.remove('selected');
        }
      });

      const item = cardData[index];
      detailText.innerHTML = `${item.icon} <span class="highlight">${item.title}</span> ${item.desc}`;
    }
  </script>
</body>
</html>

science.ks2.y1.t3.s2

Aligned learning resources

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