ROCKS

TYPES OF ROCKS

IGNEOUS ROCKSIGNEOUS ROCKS

SEDIMENTARY ROCKSSEDIMENTARY ROCKS

METAMORPHIC ROCKSMETAMORPHIC ROCKS

IGNEOUS ROCKS

Igneous means “made from fire or heat”.

Igneous rock is formed when magma from deep inside the Earth forces its way out and reaches the Earth’s surface.

Magma- molten or liquefied rock

TWO KINDS OF IGNEOUS ROCKS

EXTRUSIVE IGNEOUS This forms when magma comes to the

surface and cools quickly. The slower the rocks cool down, the larger

the crystals that are formed.

TWO KINDS OF IGNEOUS ROCKS

INTRUSIVE IGNEOUS It is formed when magma hardens or cools

slowly inside Earth. Slowly cooling magma forms coarse-

grained rocks.

EXAMPLES OF IGNEOUS ROCKS

Granite Basalt Pumice Obsidian Peridotite Gabbro

TYPES OF ROCKS

SEDIMENTARY ROCKS

Made from pieces of rocks and minerals called sediments which form in layers

The particles were buried, compressed and cemented to a solid mass.

Lithification- the process that turns the loose sediments in the bottom of the sea or river bed into hard sedimentary rocks

EXAMPLES OF SEDIMENTARY ROCKS

Shale Limestone Sandstone Coal Breccia Flint

TYPES OF ROCKS

METAMORPHIC ROCKS

Metamorphic means ‘change in form’ Either sedimentary or igneous rocks

that become different in color, hardness and in other ways because of their exposure to heat and pressure

EXAMPLES OF METAMORPHIC ROCKS Marble Slate Schist Gneiss Quartzite