Zusammenfassung der Ressource
Rocks
- Igenous-from molten rocks
- Plutonic rocks- from magma at depth (more crystallized)
- Volcanic rock- from lava at surface (fine-grained,
- Volcanic Glass- fast cooling at surface prevents crystals
- Sedimentary- from by deposition of Earth's sediment;
formed from mechanical break up of another rock
- Lithification- compacts sediments together
- Metamorphic- from heat/pressure
- Contact Metamorphism- heat from magma
chambers changes the adjacent rock
- Regional Metamorphism- heat/pressure
can affect rocks over big area
- Law of Superposition: theory that
strata at bottom are oldest
- Classifying Rocks:
- Grain size
- Coarse= gravel
- Medium= sand
- Fine=silt
- Very Fine= mud
- Grain shapes
- Angular
- Sub-Angular
- Sub-rounded
- Rounded
- Better sorted and rounded rocks traveled further from the surface
- Rock Cycle: