my+rocks

=my rock=

Rock families there are 3 rock families: 1. igneous fire rock 2. sedimentary water rocks 3. metamorpnic changed rocks 1. igneous rock born of fire Igneous rock forms from melted rock lava or magma when it cools. When lava and magma cool they form two different kinds of igneous rock: 1. __Intrusive__ rock igneous rock that is formed from cooled magma e.g. granite 2. extrusive rock igneous rock that is formed from cooled lava e.g. pumice 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. __ Sedimentary rocks __ __ Rock that is made from sediments little pieces of rocks __ Most sedimentary rocks cannot form with out water. Sediments are little rocks and plant/animal remains 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 togrther 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

sandstone is a type of rock composed chiefly of sand that has been "cemented" together by pressure or by minerals.

was once widely used to build houses in the Eastern United States

mudstone{shale}

grained sedimentary rock that is formed by the compression of muds.

Shale is ground up for use in making bricks

coal Coal is a black or brown rock that can be ignited and burned Metamorphic rocks Metamorphic rock –changing form Once a rock exists as igneous or sedimentary it can be changed into another different kind of 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 and heat to form a new metamorphic rock Examples: Granite=gneiss Sandstone=quartzite Mudstone=slate Limestone=marble