My+rocks

=__**Rock Families**__= = = è ** There are three types of igneous rocks... ** è ** Igneous rock (born of fire) forms from melted rock (lava and magma). ** è ** Lava is melted rock that is found outside the Earth’s crust. ** è ** Magma is a melted rock found on the inside of the Earth’s crust. ** è ** When lava and magma cool they form two different kinds of igneous rocks. ** è **__ In __**** trusive rock is igneous rock that is formed from cooled magma (e.g. granite). ** è **__ Ex __**** trusive rock is igneous rock that is formed from cooled lava (e.g. pumice and basalt and Rhyolite). ** è ** Extrusive rock (from lava) cools quickly and forms small crystals. ** è ** Intrusive rocks (from magma) cool very slowly inside the Earth’s crust forms large crystals. **
 * 1) ** Igneous rocks (fire rocks). **
 * 2) ** Sedimentary (water rocks). **
 * 3) ** Metamorphic changed rocks. **
 * Granite- Extrusive rock **
 * Basalt- Instursive rock **
 * Rhyolite- Instrusive rock **

**__ Sedimentary Rock __**

è ** A rock that is made from __sediments__ (little pieces of rocks). Most sedimentary rocks cannot form without **** water ****. **

è ** Sediments are little pieces of rock such as sand, mud, gravel, plant and animal remaining’s (fossils). **

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

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

è ** These beds push on the layers below and create enough pressure to from sedimentary rock __compaction__. **

è ** Or, as dripping water coats the sediment with dissolved minerals and cement the pieces together __cementation.__ ** =**e.g.**=

**__ Metamorphic rock __**

è ** A metamorphic rock means “changing form”. **

è ** Once a rock exists as (igneous or sedimentary) it can be changed into another different kind of rock using pressure and heat (and a lot of time). **

è ** Metamorphic rock is a rock that has changed form into a new type of rock. **

è ** The original rock (parent rock) is changed by pressure and heat to form a new metamorphic rock. **

è ** Examples **


 * 1) Granite- turns into Gneiss
 * 2) Sandston- turns into Quartzite
 * 3) Mudstone- turns into Slate
 * 4) Limestone-turns into Marble