Rocks and Roles #RocksAndRoles

Types of Rock


Sedimentary rocks are types of rock that are formed by the deposition of material at the Earth's surface and within bodies of water. Sedimentation is the collective name for processes that cause mineral and/or organic particles to settle and accumulate or minerals to precipitate from a solution.

Selenite is an example of a sedimentary rock


Igneous rock is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava.

Diorite is an example of an iigneous rock.


A metamorphic rock is a result of a transformation of a pre-existing rock. The original rock is subjected to very high heat and pressure, which cause obvious physical and/or chemical changes. Examples of these rock types include marble, slate, gneiss, schist.

Gneiss is an example of Metamorphic rock


Stratification is the formation or deposition of layers, as of rock or sediments.

Age Estimation of Landforms through Rock

Scientists could calculate the age of some landforms by studying the thickness and types of rock around the landform and use logical reasoning to apply their knowledge of rocks to what they find.

Rock Cycle