Rocks “A rocks a rock! A mineral is a rock too! There’s no difference!” Rock – a mixture of minerals or organic matter Three types of rock: Igneous Metamorphic.

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Presentation transcript:

Rocks “A rocks a rock! A mineral is a rock too! There’s no difference!” Rock – a mixture of minerals or organic matter Three types of rock: Igneous Metamorphic sedimentary

Igneous Rocks Igneous rocks were once completely melted rock (in a liquid form) that have cooled and solidified Formed from magma or lava Magma? Lava? “what’s the big deal?”

Igneous Rocks: Grain Size Igneous rocks with large grains are called intrusive rocks Slow cooling = large grains (underground) Igneous rocks with small grains are called extrusive rocks Fast cooling = small grains (above ground)

Igneous Rocks: Composition Light colored rocks are made of light minerals examples: Dark colored rocks are made of dark minerals Minerals are evenly spread in Igneous rocks

Igneous Rocks: cooling rate Intrusive rocks Form slowly beneath the surface (=______ grains) Extrusive rocks cooling rates fast: Can flow out of volcano as lava faster: Can be shot out of volcano and into air (air bubbles can form in the rock) fastest: can prevent crystals from forming