lesson
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If you pick up two rocks from your schoolyard, one might feel rough like sandpaper while the other is slick and shiny like glass. Why aren't all rocks the same?
Scientists called geologists study rocks up close using a hand lens, which is a small pocket magnifying glass.
📊Interactive hand lens viewer diagram. On the left, a cartoon rock sample. In the middle, a magnifying hand lens with an animated zoom effect showing the rock's surface zoomed in 10x on the right. Callout labels point to: 'Hand Lens (Magnifier)', 'Rough Texture', and 'Tiny Grains'. Light neutral background (#f8f9fa), border #e6e6e6, dark navy text #1e2945, teal accent #0ea5e9.
When you zoom in through a hand lens, what specific clues should you look for to tell rocks apart?
The Four Rock Clues
The first clue is grains, which are tiny pieces of sand or pebble bits stuck together.
The second clue is crystals, which are shiny mineral shapes with flat sides that fit together like puzzle pieces.
📊Side-by-side comparison diagram showing Grains vs. Crystals under a magnifying lens. Left panel: 'Rounded Grains' showing individual round specks glued together with visible gaps (like Sandstone). Right panel: 'Interlocking Crystals' showing shiny, angular puzzle-piece shapes locked tightly with no gaps (like Granite). Color-coded labels in navy #1e2945, accent gold #f59e0b for crystals, accent sand #d97706 for grains. Clean card layout.
The third clue is layers, which look like flat stripes or stacked sheets of paper pressed together.
The fourth clue is texture, which describes how the rock feels in your hand — such as rough, crumbly, smooth, or glassy.
📊A 4-grid visual reference card summarizing the four rock clues. Card 1: 'Grains' (sandpaper-like dots). Card 2: 'Crystals' (sparkly angular facets). Card 3: 'Layers' (horizontal colored bands/stripes). Card 4: 'Texture' (hands feeling smooth vs. rough surfaces). Clean icons and bold headings on each card. Responsive width down to 350px.
How do we take these four clues and actually sort a tray of mystery rocks into groups?