At the beginning of the Proterozoic, Earth’s atmosphere was mostly ____

a. oxygen
b. nitrogen
c. carbon dioxide
d. water vapor
e. argon


c

Environmental & Atmospheric Sciences

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The oceans cover about 50 percent of the earth's surface

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

What type of continental margin is presently represented by the eastern edge of North America? How did it form?

What types of sedimentation is this margin experiencing? What will be an ideal response?

Environmental & Atmospheric Sciences

About ________ gallons of used motor oil pollutes the sea annually

a. 240 million b. 100 million c. 24 billion d. 100 thousand

Environmental & Atmospheric Sciences

If a liquid with a lower density than mercury were used in a barometer the height of the column in

the barometer would:a. increase. b. decrease. c. remain the same. d. not provide an accurate measure of atmospheric pressure

Environmental & Atmospheric Sciences