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|30 Days of Gratitude- Day 28||by aussiegall on Flickr|
There are three kinds of rocks:
They change during the Rock Cycle.
|sandstone||by kevinzim on Flickr|
This is sandstone. It is a sedimentary rock.
Sedimentary rock has lots of layers. You can see them here. It is made from sediments squeezed together over thousands of years.
|488 - Lava Texture||by Patrick Hoesly on Flickr|
Igneous rock is made from lava or magma. Lava and magma are melted rock. When it hardens it is igneous.
|'Pebbles' in a Molten Sea||by subarcticmike on Flickr|
This is a black igneous rock.
|Pillow lava||by Fermion on Flickr|
Not all igneous rocks are black. This igneous rock was formed from lava.
|Metamorphic||by subarcticmike on Flickr|
is made from heat and pressure
|Quartzite vein, in Pelite/Psammite, Dalradian metamorphic rock, Creigh Hill, 16/02/2008||by Shandchem on Flickr|
You find crystals in some metamorphic rocks.
|Amazing metamorphic rock||by Ricky Cosmos on Flickr|
This huge rock is Metamorphic.