- Sedimentary rock is rock that has formed from sediment deposited by water or air. (sandstone)

- Metamorphic rock is denoting rock that has undergone transformation by heat, pressure, or other natural agencies, e.g., in the folding of strata or the nearby intrusion of igneous rocks. (marble)

- Igneous rock is rock having solidified from lava or magma. (basalt)

- Stratification is a system or formation of layers, classes, or categories.

The age of rocks can be defined by the number of thickness is the more lines there are in the rock that means the rock is older. The fossils inside will be older the deeper they are in the lines of the rock.

If there are large, thick layers of rock then there could have been a landslide, or a very heavy rainfall.

Living organisms have shaped land forms in many ways. Walking on landforms can shape the ground and erode away layers of earth. Plants give off seeds that grow new plants which can change the land.