Earth is about ________ years old.
A. 50 million
B. 3,500 million
C. 13.5 billion
D. 4.5 billion
E. 30,000 thousand
Answer: D
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Which of the following is NOT a threat to endangered sea turtles?
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Discuss five important human modifications of the Southwest Asian and North African environment, and assess whether these changes have benefited the region
What will be an ideal response?
Describe the electrical properties of the D-layer of the ionosphere and explain its relationship to the transmission of AM radio waves
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The process by which ice evaporates directly from the surface of a glacier is known as
____________________. Fill in the blank(s) with the appropriate word(s).