Flashcards
Dynamic Crust. Unit 4
Cards in this deck (23)
- 1—layers of the earth
- 2—oceanic- thinner, less dense, basalt
Continental- thicker, more dense, granite
- 3—Lithosphere made up of crust and upper mantle
- 4—MOHO
between crust and rigid mantle
- 5—Most common elements in crust
- 6—thickest layer, part solid, part liquid
- 7—Plastic mantle
layer in which convention occurs
- 8—convection currents in the asthenosphere move the plates around
- 9—Believed to be entirely liquid iron and nickel. Evidence is that S waves do not pass through this layer
- 10—inner core
solid iron and nickle highest density
- 11—properties of earth's interior
- 12—temperature and pressure increase as you travel deeper into the earth
- 13—The lithosphere of the earth is broken up into plates
which “float” on the plastic asthenosphere below
- 14—Theory developed in the mid-1900’s that explained all geologic observations including mountains, earth-
quakes, volcanoes, and trenches
- 15—convergent
move towards each other
- 16—Divergent
move away from each other
forms a ridge
- 17—Transform
slide past one another
earthquakes found here
- 18—Subduction zone (continental crust and oceanic crust)
The oceanic crust beneath because
it is more dense
Volcanoes, mountains, earthquakes and trenches
- 19—HOT SPOTS
• There are locations on earth, away from plate boundaries,
where volcanic activity occurs
- 20—fold
- 21—fault
- 22—Collision zone (continental crust and continental crust)
colliding plates with same density
crumple up as they collide
• Mountains and earthquakes
- 23—Island Arc (oceanic crust and oceanic crust)
two oceanic plates collide and one usually subducts
Volcanic islands, earthquakes and trenches