If we use a 24-hour day to represent Earth's history, humans would have existed for the last:

a. 1 minute.
b. 1 hour.
c. 2 hours.
d. 5 hours.
e. 12 hours.


A

Environmental & Atmospheric Sciences

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The gas that shows the most variation from place to place and from time to time in the lower

atmosphere is: a. ozone (O3). b. carbon dioxide (CO2). c. water vapor (H2O). d. methane (CH4). e. argon (Ar)

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In Glacial topography, a Hanging Valley is:

a. A tributary valley whose floor is at a higher level than that of the main valley b. A bowl-shaped depression that forms at the upper end of glacial troughs c. A thin ridge formed by the headward erosion of two cirques (on opposite sides of a ridge) d. A steep-walled pyramidal peak

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What are the major differences between the political system that governs the United States and the system of government in Canada?

What will be an ideal response?

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The Environmental Protection Agency considers this city to have the worst ozone pollution

A) Los Angeles B) Chicago C) New York D) Phoenix

Environmental & Atmospheric Sciences