basalt, a very hard dark grey igneous rock, cementation, process where salt crystals glue the layers together in a sedimentary rock, coal, formed from the remains of dead plants buried deep below the surface of the earth, compaction, process where layers of material pile up on each other and press down on the lower layers., conglomerate, sedimentary rock with well rounded pebbles which have been cemented together, extrusive, Igneous rock formed on the surface, igneous, rocks that are formed when magma or lava cool and solidify, intrusive, a kind of igneous rock that forms when cooled slowly below the surface, limestone, a sedimentary rock that often contains shells and shell fragments, magma, hot liquid rock from below the crust, obsidian, a black glassy igneous rock, sedimentary, type of rock that forms from weathered rock fragments that have been compacted and cemented together., metamorphic, rocks that are formed when a parent rock is transformed through heat and pressure, marble, a non-foliated metamorphic rock formed from limestone.

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