DeOntae’ Waller9.30.11

Rocks

Metamorphic Rocks

A rock that is subjected to heat and pressure. They may be formed simply by being deep

beneath the Earth's surface. Being formed they are subjected to high

temperatures and the great pressure of the rock layers above it.

Some examples of metamorphic rocks are gneiss, slate, marble, schist, and quartzite.

There also are two types, Foliated and Non foliated.

Non foliated Metamorphic do not have a layered or banded appearance

Igneous

forms when magma (molten rock) cools and solidifies. The solidification process may or may not involve crystallization, and it may take place either below the Earth's surface to generate "intrusive" rocks or on the surface to produce "extrusive" rocks.

Intrusive Igneous

Intrusive rocks are formed inside of the earth.

Examples include Granite.

Extrusive igneous

Extrusive rocks Are formed on the earth’s surface.

Examples include Pumice, Obsidian, and Basalt.

Sedimentary

These rocks are a type of rock that is formed by sedimentation of material at the Earths surface and within bodies of water.

Particles that form a sedimentary rock by accumulating are called sediment.

Before being deposited, sediment was formed by weathering and erosion in a source area.

How are rocks formed

Rocks are formed in several type of ways. For example metamorphic is formed by the

process of heat and pressure. Sedimentary Rocks are formed through the

process of weathering and erosion. Not last but least igneous rocks are formed

through Underground, they are formed when the melted rock, called magma, deep within the earth becomes trapped, they also are formed as the lava cools above ground.

Rock cycle

Ending slide