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Which Rock is an ultramafic rock?

Ultramafic rock. Ultramafic (or ultrabasic) rocks are dark-colored igneous and meta-igneous rocks that are rich in minerals containing magnesium and iron ("mafic" minerals) and have a relatively low content of silica. The Earth's mantle is thought to be composed of ultramafic rocks.

Which Rock is a sedimentary rock?

Sedimentary rocks are rocks formed from sediment. They are deposited over time, and often show layers which can be seen in cliffs. Other types of rock are igneous rock and metamorphic rock. Sediments are usually formed from matter which falls to the bottom of oceans and lakes.

How are rocks classified in the rock cycle?

The rock cycle is a process by which rock changes from one type to another. Rocks are classified according to how they are formed. Rocks that are formed by cooling magma or lava are called igneous rocks. Rocks that are formed by weathered particles that become compacted and cemented are called sedimentary rocks.

What type of a rock is a chemical rock?

The most common chemical sedimentary rock is limestone. Composed mostly of the mineral calcite (CaCO3), limestones are usually formed by biochemical processes in shallow seawater.


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