Approximately how long has there been life on planet Earth?
a. 3.5 million years
b. 35 million years
c. 350 million years
d. 3.5 billion years
e. 35 billion years
D
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Tropical rain forests cover about 2% of the Earth's land surface, and
a. contain about 2% of the Earth's total biodiversity b. contain less than 10% of the Earth's total biodiversity c. contain no more than one-fourth of the Earth's total biodiversity d. contain up to one-half of the Earth's total biodiversity e. scientists currently do not know how much of the Earth's total biodiversity is contained in tropical rainforests, although they suspect it is very high
The length of time preserved in Grand Canyon rocks is about:a
10,000 years. b. 100,000 years. c. 1 million years. d. 1 billion years. e. 10 billion years
Atlantic-type margins are classified as active margins
Indicate whether the statement is true or false
List the typical data gathered at surface weather observation stations in the United States
What will be an ideal response?