Rocks

Rachel Thornton
Mind Map by Rachel Thornton, updated more than 1 year ago
Rachel Thornton
Created by Rachel Thornton almost 5 years ago
6
1

Description

Mind Map on Rocks, created by Rachel Thornton on 10/06/2015.

Resource summary

Rocks
1 Igenous-from molten rocks
1.1 Plutonic rocks- from magma at depth (more crystallized)
1.1.1 Volcanic rock- from lava at surface (fine-grained,
1.1.1.1 Volcanic Glass- fast cooling at surface prevents crystals
2 Sedimentary- from by deposition of Earth's sediment; formed from mechanical break up of another rock
2.1 Lithification- compacts sediments together
3 Metamorphic- from heat/pressure
3.1 Contact Metamorphism- heat from magma chambers changes the adjacent rock
3.1.1 Regional Metamorphism- heat/pressure can affect rocks over big area
4 Law of Superposition: theory that strata at bottom are oldest
5 Classifying Rocks:
5.1 Grain size
5.1.1 Coarse= gravel
5.1.1.1 Medium= sand
5.1.1.1.1 Fine=silt
5.1.1.1.1.1 Very Fine= mud
5.2 Grain shapes
5.2.1 Angular
5.2.1.1 Sub-Angular
5.2.1.1.1 Sub-rounded
5.2.1.1.1.1 Rounded
5.3 Better sorted and rounded rocks traveled further from the surface
6 Rock Cycle:
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