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
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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)
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
The Environmental Protection Agency considers this city to have the worst ozone pollution
A) Los Angeles B) Chicago C) New York D) Phoenix
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?