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Free CLEP Science and Mathematics Exam Braindumps (page: 51)

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PDF with 494 Questions

Which of the following phenomena is NOT caused by the movement of the plates on the earth's upper mantle?

  1. Earthquakes
  2. Volcanic activity
  3. Production of new crust along with destruction of old crust
  4. Erosion
  5. Formation of mountains

Answer(s): D

Explanation:

Erosion the process by which the surface of the earth is worn away by water or wind.



Two hundred and fifty million years ago, which of the following continent(s) existed?

  1. Laurasia
  2. Gondwanaland
  3. Pangea
  4. Panthalassa
  5. The current continents

Answer(s): C

Explanation:

All the earth's continents were connected into one large continent called Pangea surrounded by one large ocean called Panthalassa. Approximately 180 million years ago, Pangea split apart into two continents called Laurasia and Gondwanaland.



The earth is not a sphere, rather it is an ellipsoid; it is flatter at the poles and bulges at the equator. This is a result of

  1. the pull of the moon being stronger at the equator than at the poles
  2. the pull of the sun being stronger at the equator than at the poles
  3. how the continents have drifted
  4. warmer temperatures at the equator
  5. centripetal forces resulting from the earth's rotation about its axis

Answer(s): E

Explanation:

The earth spins about its axis. The centripetal forces are greatest where the diameter is greatest, which causes the center to bulge and the poles to flatten.



The earth's early atmosphere is thought to have been composed of mostly carbon dioxide with less than a percent of molecular oxygen present. Life first evolved in this atmosphere. Where did the molecular oxygen in Earth's atmosphere come from?

  1. Hydrolysis of water
  2. Photosynthesis
  3. Cellular respiration
  4. Lightning strikes
  5. Nuclear reactions

Answer(s): B

Explanation:

The first life forms were photosynthetic plants. In the process of photosynthesis water and carbon dioxide are consumed and glucose and molecular oxygen are created.






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