Metamorphic Rock

Slate

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

Sand stone- Quartzite

Shale- Slate

Lime stone-Marble

Sedimentary Rocks

-Sedimentary rock-rock that is made from sediments (little pieces of rocks)little pieces of rock such as sand,mud and gravel (and plant and animal remains - fossils

Most sedimentary rocks cannot form without water

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

AS the sediments slowly pile on top of each other , they become tightly packed or 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.

Granite

Mud stone ( shale )

Coal

Fire Rock

Igneous Rock –
‘’Born of fire’’
Igneous rock forms from melted rock ( lava or magma ) when it cool.
When lava and magma cool , they form two different of igneous rock :

1.Intrusive rock – igneous rock that is formed from cooled magma ( e.g. granite ).

2.Extrusive rock –
3.Igneous rock that is formed cooled lava (e.g. pumice)

Extrusive rock (from lava) cools quickly and forms small crystals.
Intrusive rock (from magma) cools very slowy inside the earths crust and forms large crystals.

Rhyolite

Basalt

Granite

My Rocks

Sedimentary Rocks