My+Rocks

There are three rock families:
 * Rock Families **
 * 1) 1 Igneous (Fire Rocks)
 * 2) 2 Sedimentary (Water Rocks)
 * 3) 3 Metamorphic (Changed Rocks)

Igneous Rock- “Born of Fire” Igneous rock forms from melted rock when it cools. (Lava or magma) Lava- 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 two different kinds of igneous rock: Intrusive rock- Igneous rock that is formed from cooled magma (e.g. granite) __ Ex __ trusive rock- Igneous rock that is formed from cooled lava (e.g. pumice, basalt, rhyolite) Extrusive rock (from lava) cools quickly and forms small crystals. Intrusive rock (from magma) cools very slowly inside the Earth’s crust and forms large crystals.
 * 1) 1 Igneous Rock








 * 1) 2 Sedimentary Rocks

Sedimentary rock- is rock that is made from __sediments__ (little pieces of rocks).

Most sedimentary rocks cannot form without water.

Sediments- little pieces of rock such as sand, mud, and gravel (and plant and animal remains –fossils)

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

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

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.__ E.g mudstone (shale), sandstone, limestone, and comglomerate.