A | B |
Igneous rocks | are formed by volcanic lava that has cooled and hardened. |
Sedimentary rocks | are formed by many layers of earth. |
Metamorphic rocks | are formed by heat and pressure. |
Plate tectonics | is the movement of the plates of the earth. |
Weathering | is a natural wearing away of soil. |
Erosion | is moving rock and soil to another place. |
Earth's layers | are the crust, mantle, and core. |
Earthquakes and volcanoes | cause changes from within the earth. |
Fossils are | remains of dead plants and animals usually found on sedimentary rocks. |
The rock cycle | is a never ending process of rocks being changed from one form to another. |