| A | B |
|---|
| igneous rock | rock that is made from cooled magma |
| molten | rock that has become liquid due to extreme heat |
| magma | molten rock (underground) |
| lava | molten rock that flows out of an erupting volcano (above ground) |
| erupt | an explosive event causing lava, ash and rocks to spew from a volcano |
| intrusive rock | magma forced into cracks of other rocks and crystallize underground |
| extrusive rock | rock that forms from cooled lava (above ground) |
| metamorphic rock | sedimentary or igneous rock which has been exposed to pressure and/or heat causing a change in its structure |
| *feldspar, mica, quartz | 3 types of minerals found in rocks, especially granite |
| **granite | type of hard igneous rock made of large crystals, usually feldspar, mica, and quartz (intrusive) |
| **basalt | type of hard, dense igneous rock (extrusive) |
| **obsidian | smooth type of igneous rock that has no crystals and looks like black glass (extrusive) |
| **pumice | type of porous igneous rock that is very rough and abrasive; it forms when magma becomes filled with air, like foam, and then cools very quickly (extrusive) |
| ***slate | type of metamorphic rock formed from mudstone |
| ***marble | type of metamorphic rock that is formed from limestone |
| ***quartzite | type of metamorphic rock formed from sandstone |
| fossil | a plant or animal that has been preserved in a rock |
