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