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Rocks and Minerals
  
30 Days of Gratitude- Day 28by aussiegall on Flickr

There are three kinds of rocks:  
  1. Sedimentary
  2. Igneous
  3. Metamorphic

They change during the Rock Cycle.  
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sandstoneby kevinzim on Flickr

This is sandstone.  It is a sedimentary rock.  
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by jared on Flickr

Sedimentary rock has lots of layers.  You can see them here.  It is made from sediments squeezed together over thousands of years.  
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488 - Lava Textureby Patrick Hoesly on Flickr

Igneous rock is made from lava or magma. Lava and magma are melted rock.  When it hardens it is igneous.  
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'Pebbles' in a Molten Seaby subarcticmike on Flickr

This is a black igneous rock.  
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Pillow lavaby Fermion on Flickr

Not all igneous rocks are black.  This igneous rock was formed from lava.  
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Metamorphicby subarcticmike on Flickr

Metamorphic rock  is made from heat and pressure
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Quartzite vein, in Pelite/Psammite, Dalradian metamorphic rock, Creigh Hill, 16/02/2008by Shandchem on Flickr

 You find crystals in some metamorphic rocks. 
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Amazing metamorphic rockby Ricky Cosmos on Flickr

This huge rock is Metamorphic.  
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