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28 Cards in this Set

  • Front
  • Back
Early Models of the Universe
Geocentric (Earth centered)
Heliocentric(Sun centered)
Big Bang Theory
.001 seconds after neutrons and protons were produced.

3min after neutrons and protons combined to form stable nuclei

400,0000yrs after atoms were formed
Early universe properties
smaller, hotter and more dense
how did planets, stars, and galaxies form?
material condensed due to gravitational attraction
Evidence of BB theory and Expansion
Red Shift of stars, background radiation
Differentiation of Earth
the heavy elements sink to the middle and the lighter elements float on the surface.
composition: earth v crust
Earth 15%silicon
Crust Oxygen 46%
Silicon 28%
Moon formation
planetesial size of mars collides with earth. the excess dust/meteors, move around the planet.
difference between lithosphere and asthenosphere?
the lithosphere is the top surface and is broken into plates. Asthenosphere is solid and is able to flow
How do we know that the center looks like?
Density of earth v crust
meteorite composition
volcanic activity
magnetic field
p-waves and s-waves
p-waves fast and slinky
s-waves slower and wavy
boundary between crust and mantle. big jump at base of crust
differences in composition of ocean and continental crust
oceanic crust is more mafic(dark) and more dense
Continental is felsic(light) and less dense
Alfred Wegner
First proposed the continental drift.
suggested the idea of pangaea
evidence Pangaea
fit of continents
record of past glaciations
rock record
fossil evidence
plate boundary types
earth ocean
ocean ocean
earth earth
relative plate velocity
plates moving with respect to each other
absolute plate velocity
movement of plates relative to a fixed point
what is a mineral?
combination of elements, inorganic, crystalline, solid
what is a rock?
minerals are the building blocks
building blocks for everything, cant be broken down
different amounts of neutrons, different mass
covalent bonding
outer electrons shared by neighbors, strong bond
van der waals bonds
acts between covalently bonded molecules, pencil writing
by far the dominant rock forming minerals
key minerals in igneous
feldspar, quartz, mica,pyroxene, amphibole, olivine
key minerals in sedimentary
feldspar, quartz, clay minerals, halite
key minerals in metamorphic
feldspar, quartz, mica, pyro