AI Tutor
If you zoom in on a satellite map of Earth, you will not see smooth, flat ramps of dirtβ€”you will see intricate branching veins and colossal gorges carved into solid rock.
Flowing water is Earth's primary sculptor, endlessly tearing down mountains and rebuilding coastlines.
How does a simple trickle of rainfall end up carving a canyon over a mile deep?

How Surface Water Carves Landscapes

When water flows over land, it reshapes the surface through erosion (stripping away rock and soil) and deposition (dropping carried sediment when the water slows down).
Steep slopes give mountain streams high speed to gouge out sharp, V-shaped valleys, while flatter lowlands slow the water into sweeping loops called meanders.
Rivers do not flow out of nowhereβ€”so how does water scattered across thousands of square miles organize into a single mighty channel?

Drainage Basins and Network Patterns

A drainage basin (also called a watershed) is the entire area of land where all incoming precipitation drains toward a single common river or lake.
The perimeter of every basin is marked by a drainage divideβ€”a high ridge or mountain crest that splits runoff, sending water down opposite slopes toward completely different oceans.
As tributaries merge into main rivers, the underlying geology forces them into distinct channel geometries called drainage patterns.