My+Rocks

The are three rock families; #3 Metamorphic (Changed Rocks) Lava is melted rock that is found outside (“on”) the Earth’s crust. Magma - melted rock that is found inside the Earth’s crust. When lava and magma cool, they form different kinds of rock :
 * Rock Families **
 * 1) 1 Igneous (Fire Rocks)
 * 2) 2 Sedimentary (Water Rocks)
 * 1) 1 Igneous rock forms from melted rock (lava or magma) when it cools.
 * 1) __ In __ trusive rock- igneous rock that is formed cooled magma (e.g. granite)
 * 1) __ Ex __ trusive rock – igneous rock that is formed from cool lava (e.g. pumice,basalt, rhyolite)

Extrusive (from lava) cools quickly and forms small crystals. Intrusive (from magma) cools very slowly inside the Earth’s crust and forms large crystals.

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**Sedimentary Rock**

__ Sediment __ ary rock – rock that is made from sediments (little pieces of rocks).

Most sedimentary rocks cannot form without water.

Sediments include plant and animal remains (fossils).

These sediments are moved by water,wind, and gravity and settle on top of each other in layers.

As these layers of sediment slowly pile on top of each other, they become tightly packed or cemented together to form

These beds push on the layers below and create enough pressure to form sedimentary rock

- __ Compaction __

Or, as dripping water coats the sediment with dissolved minerals and cements the pieces together - __cementation__ **__ Metamorphic Rock __** Metam__orph__ic Rock – “Changing Form” Once a rock exists (as igneous or sedimentary), it can be changed into a another, different kind rock by using pressure and heat (and A LOT of time!) Metamorphic Rock – rock that has changed form into a new type of rock. The original rock (parent rock) is changed by pressure by pressure and heat to form a new metamorphic rock. **Examples** Granite –> Gneiss Sandstone -> Quartzite Mudstone -> Slate Limestone -> Marble