set of natural processes that form, change, break down, and reform rocks.

rock that forms as molten rock cools

rock that forms as heat and pressure cause changes to an existing rock

This rock type forms as loose materials called sediments become cemented together. Usually, these rocks have layers.

little pieces of weathered rock, plant remains, and animal remains

These two forces work together to transform rocks deep inside Earth's crust.

This is the breaking down of rocks. It can be caused by wind, rain, ice, or gravity.

The movement of sediments. This can be caused by water, wind, or even glaciers.

This causes the most erosion in dry areas that get little rainfall.

This is molten rock that is on Earth's suface. For this to happen, it has to erupt from a volcano.

This is molten rock underneath Earth's surface.

This is the process that forms igneous rock.

These are the processes that form sedimentary rock.

This igneous rock formed underground as magma cools slowly. Because it cools slowly, the crystals inside the rock grow very large.

This igneous rock forms as erupted lava cools quickly on Earth's surface. Because it cools so quickly, these rocks have very, very tiny crystals.

This is the remains or impression of an ancient organism. These are only found in sedimentary rock (not igneous or metamorphic).

Rocks are classified into groups based on how they _____.

This is the process that changes Igneous and Metamorphic rock to magma.