Which process is responsible for the oxygen in the atmosphere today?
A) Photosynthesis
B) Outgassing of volcanoes
C) Weathering of carbonate rocks
D) Asteroid impact
Answer: A
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The Vietnam War started when which European country tried to retain control of its Southeast Asian colonies?
A) Great Britain B) the Dutch C) Spain D) United States E) France
Where in the thunderstorm would you be most likely to find mammatus clouds?
A) Letter F B) Letter E C) Letter C D) Letter D
________ is the large impact crater in southern Ontario that is about 100 km in diameter and dates to about 214 million years.
A. Manicouagan B. Barringer C. Crooked Creek D. Upheval Dome
At its maximum extent, continental glacial ice in North America extended as far south as ________
A) the Gulf of Mexico B) Florida C) Minnesota D) The Ohio River E) Montana