Layers of the Earth
  • 1. The thinnest layer of the earth's layers is called the:
A) outer core
B) crust
C) mantle
D) inner core
  • 2. The thickest layer of the earth's layers is called the:
A) inner core
B) outer core
C) crust
D) mantle
  • 3. Continental crust is made up of mostly:
A) nickel
B) granite
C) basalt
D) iron
  • 4. Oceanic crust is made up of mostly:
A) iron
B) granite
C) basalt
D) nickel
  • 5. The outer core is __________ km thick.
A) 1250
B) 2900
C) 3450
D) 2200
  • 6. The inner core is __________ km thick.
A) 1250
B) 3450
C) 2200
D) 2900
  • 7. The state of matter in the crust is:
A) solid rock
B) molten rock
C) plasticity
D) liquid rock
  • 8. The state of matter in the mantle is:
A) molten rock
B) liquid rock
C) solid rock
D) elasticity
  • 9. The state of matter in the outer core is:
A) solid rock
B) molten rock
C) liquid rock
D) elasticity
  • 10. The state of matter in the inner core is:
A) liquid rock
B) molten rock
C) solid rock
D) plasticity
  • 11. The earth's core is composed of:
A) nickel and iron
B) granite and iron
C) basalt and iron
D) basalt and granite
  • 12. The lithosphere includes the:
A) middle and outer mantle
B) outer core and lower mantle
C) the upper mantle
D) crust and outer mantle
  • 13. Convection currents occur in the:
A) middle mantle
B) lower mantle
C) entire mantle
D) upper mantle
  • 14. The earth's crust ranges from 8 to ______ km thick.
A) 25
B) 32
C) 50
D) 48
  • 15. The average distance from the earth's surface to the center is about _________ km.
A) 5150
B) 7000
C) 3975
D) 6370
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