Rocks & Roles
In Earth's History

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Sedimentary- are types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water.
*Sandstone is a sedimentary rock

Metamorphic- Rock that was once one form of rockbut has changed to another under the influence of heat, pressure, or some other agent without passing through a liquid phase.
*Gneiss is a metamorphic rock

Igneous- is formed through the cooling and solidification of magma or lava.
*Diorite is an igneous rock

Stratification- is the relative social position of persons in a given social group, category, geographical region or other social unit.

The age of landforms can be estimated by rock layers and fossils because what we see in fossils can lead to inferences about evolution. Rock layers take years to form so by looking at a rock with hundreds of layers, shows that it has been around for a very long time.

Geologic events could have caused huge blocks of horizontal sedimentary layers to be tipped or older rock layers to be on top of younger rock layers because heat and magma from under Earth's crust causing more layers to be made on the bottom of the sedimentary layers, making older layers on the top and newer layers on the bottom. Also sedimentary blocks can be tipped by Earthquakes, hard winds or landslides.

Living organisms have shaped the land by decaying and creating caves.