What is considered to be the densest type of crust? a. Basalt ...

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What is considered to be the densest type of crust?
  a. Basalt
  b. Continental crust
  c. Granite
  d. Andesite

Question 2

What process intensified arguments about Earth's age because it would require long periods of time to
  occur?
  a. Uniformitarianism
  b. Catastrophism
  c. Natural Selection
  d. Biblical creation

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Answer to Question 1

ANS: A
The oceanic crust is denser in comparison to continental crust. The oceanic crust is mainly composed
of basalt which is a heavy, dark colored rock. It contains oxygen, silicon, magnesium, and iron.
Information can be found in the section Earth's Inner Structure Was Gradually Revealed.

Answer to Question 2

ANS: C
The argument as to the age of the Earth was already happening, but Charles Darwin and Alfred Russell
Wallace added to the debate with their theory of natural selection. Natural selection was a process that
required long periods of time to generate the diversity of life on Earth. Information can be found in the
section A New Understanding of Earth Evolved Slowly.

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