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