Rocks and Mineral, Rock Formations Flashcards
What are rocks?
minerals mixed together
What are minerals?
naturally occurring w/ definite chemical composition and atomic structure
How do you classify minerals?
-Color
-Hardness
-Luster
-Streak
-Cleavage/Fracture
Draw the rock cycle
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What are the types of igneous rocks?
intrusive - magma cooled slowly -> large crystals
extrusive - magma cooled quickly -> no crystals
What are the types of sedimentary rocks?
- Clastics - formed by sediments via compacting; no chemical reaction
- Bioclastics - w/ organic material (e.g. fossils)
- Crystalline - formed when minerals are compacted
after evaporation and precipitation.
How are metamorphic rocks formed?
heat and pressure
What are the forces that drive the rock cycle? Explain each one.
solar energy, gravity, radioactive heating
What are the agents of erosion?
plants, animals, people
What are the things you should look out for when classifying rocks?
- Sedimentary - fossils; looks course; composition is visible
- Igneous - has crystals; blotchy
- Metamorphic - stripes going in 1 direction; pattern
What are the structures in rock formation?
- Folds: bend upward and downward
- Fault: There is a fracture; uneven yung plane
- Joints: May fracture; even yung plane
What are the causes of deformation?
- tensional: rocks pull
- compressional: rocks squeeze
- shear: slippage/parallel movement
What are the causes of deformation?
- tensional: rocks pull
- compressional: rocks squeeze
- shear (faulting): slippage/parallel movement
What are the stages of rock formation?
Elastic (strain - reversable) -> Ductile (bend - irreversible) -> Fracture (breaks)
What are the 2 kinds of stresses? How are they different from one another?
- Confine - uniform stress
- Differential - unequal stress -> causes lengthening, folding, fractures, etc.