- form from the weathering and erosion of previous rocks
- the process is- weathering, erosion, deposition, compaction, cementation
- clastic rocks form from fragments of material ex; conglomerate and sandstone
- chemical rocks form from the precipitation of minerals from water (oceans) ex; rock salt and rock gypsum
- fossils are found in sedimentary rocks, the other rock processes would destroy the fossils. Interesting fact, even ripple marks from streams or beaches can be fossilized.
- these rocks form from extreme heat and pressure placed upon pre-existing rocks.
- heat is the primary agent for contact metamorphism, this heat is supplied by nearby magma.
- during metamorphism minerals may recrystallize, crystals can grow larger and the rock will become more compact.
- running water is NOT an agent of metamorphism.