* Waterfalls form due to differences in rock hardness: A waterfall occurs when a river or stream flows over a cliff or a steep drop. This drop is often caused by a difference in the hardness of the rocks. Harder rocks resist erosion, forming the cliff face, while softer rocks erode more easily, creating a drop.
* Types of rocks involved: The specific rocks involved can vary greatly. Common examples include:
* Igneous rocks: Granite, basalt, and rhyolite can form hard cliffs.
* Sedimentary rocks: Sandstone, limestone, and shale can create waterfalls, but these formations tend to be less dramatic due to the softer nature of the rock.
* Metamorphic rocks: Marble, schist, and gneiss are also found in waterfall formations, often because they are resistant to erosion.
So, while waterfalls aren't made of rocks, they are formed by the erosion of different types of rocks.
