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| 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 |
| Metamorphic rock
is made from heat and pressure |
| Amazing metamorphic rock | by Ricky Cosmos on Flickr |
| This huge rock is Metamorphic. |