Read the summary and the most important questions on Physical Geography #2

• Physical Geography #2

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• -low in density-averaging 2.7 g/cm3-granite-mountains extend to 50-60 km

  continental crust

• -denser than continental crust-3.0 g/cm3-composed of basalt-5 km thick

  oceanic crust

• the 3 most abundant elements in earths crust are?

  1 oxygen
  2 silicon
  3 aluminum

• an inorganic or nonliving natural solid compound having a specific chemical formula and usually possessing a crystalline structure

  mineral

• what are some common minerals on earth?

  -quartz
  -magnetite
  -pyrite
  -calcite

• one of the three basic rock types; formed from the compaction, cementation and hardening of sediments derived from other rocks.-Product of weathered rocks-generally laid down horizontally-fossils are found here

  sedimentary rock

• occur in areas of crustal collision and subduction. they form subduction zones. also occur where 2 plates of continental crust collide and where oceanic plates collide

  convergent boundaries

• coastal area features, mountains, volcanoes and earthquakes are characteristics of...

  convergent boundaries

• occur in areas of seafloor spreading, where upwelling material from the mantle forms new seafloor and lithospheric plates spread apart in a constructional process. most occur at mid-ocean ridges. a few occur within continents themselves

  divergent boundaries

• occur where plates slide past one another, usually at right angles to a seafloor spreading center. these are the fractures stretching across the mid-ocean ridge system worldwide. as plates move past each other horizontally, they form a type of fault (fracture) in earth's crust

  transform boundaries