1.
Which of the following is NOT part of the compositional structure of Earth?
A.
Global ocean
B.
Crust
C.
Mantle
D.
Core
2.
Earth was formed approximately 4.6 billion years ago.
A.
True
B.
False
3.
Approximately 60 percent of the Earth's surface is covered with the global oceans.
A.
True
B.
False
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