formed from magma pushing itself up to the crust which contains various minerals in randomly arranged interlocking crystals. The size depends at which the rate they cool. Examples: Extrusive - basalt.Intrusive - granite
sedimentary rocks
layers of sediment, cemented by minerals, which have formed over millions over years
metamorphic rocks
result of heat and extreme pressure on existing rocks. may have tiny crystals in some layers
fossils
preserved remains of a dead organism which were buried under layers of sediment
weathering
breaking down rocks into smaller bits, three types, chemical, biological and physical
