How it was formed
Formed from the hardening of molten rock, or magma, whick is called lava when it reaches the surface of the Earth.
Granite, pumice, basalt, obsidian
Formed bu the sedimentation, or gradual depositing, of small bits of rock, clay, and other materials. over thime this deposited material becomes cemented together. most fossils are found in sedimentary rocks.
shale, sandstone, gypsum, dolomite, coal
Formed when existing rock material is altered through temperature, pressure, or chemical processes.
marble, slate, gneiss, quartzite