TEST ONE Flashcards
To be a planet:
- Is in orbit around a star, but not a satellite (not a moon)
- Has sufficient mass so its nearly a spherical shape (not asteroids)
- Has cleared the neighborhood around its orbit
What happens during differentiation of the Earth’s Layers
Heavy materials - iron/nickel sink to center
Lighter materials - silicates stay closer to the surface
Chemical differentiation
Crust: silicon/oxygen based (low density)
Mantle: silicon/oxygen based (med density)
Core: Iron/nickel (high density)
Physical differentiation
Lith vs Asth
Lithosphere: RIGID / makes up the tectonic plates
Asthenosphere: PLASTIC / is the combination of temp, pressure, and composition
Physical differentiation
cores+
Outer core = liquid
Inner core = solid
Mesospher = solid
P Waves
Compression (slinky)
S Waves
Shear (rope)
can’t travel through liquid
Wave rules
waves increase speed with increased rock density
waves can be reflected away from a layer
waves change direction with rock density (refraction)
What is luster
metallic vs non-metallic
What is hardness
resistance to mineral by scratching
What is cleavage
how many planes the mineral breaks into
What is streak
the color of the dust left behind after scraping the mineral
Silicate tetrahedron is composed of:
1 silicon atom
4 oxygen atoms
with a net charge of -4
Mafic qualities
dark
Oceanic crust
higher density
contains more magnesium and iron
Felsic qualities
light
continental crust
lower density
contains less magnesium and iron
