How were large amounts of oxygen first introduced into earth's atmosphere?
a. they were deposited by comets that collided with earth.
b. they were released from the earth by erupting geysers.
c. they were produced as a byproduct of photosynthesis.
d. they were produced through atmospheric precipitation.
Answers (2)
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “How were large amounts of oxygen first introduced into earth's atmosphere? a. they were deposited by comets that collided with earth. b. ...” in 📗 Geography if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers
You Might be Interested in
What will happen to our galaxy in 4 billion years?
No Answers
Which statement explains why few rivers exist in the island regions? A There are few mountains in the region. B There isn't enough rain or snowfall for rivers to flow. C The oceans provide enough water for the region.
Answers (1)
What type of climate covers the northern half of South America, including the Amazon River Basin? A. tropical B. moderate C. polar D. dry
Answers (2)
What was the key philosophy held by founding fathers
Answers (1)
Approximately how long was the cold war period? A.) 1920s to 1940s B.) 1940s to 1980s C.) 1980s to 2000 D.) 1920s to the present day
Answers (1)
New Questions in Geography
What is a specific example of a current discourse on the human-nature relationship.
Answers (1)
When looking up at the sky/moon, what part of the sky will the sun/moon appear in
Answers (1)
Choose the state and capital that border the east coast of the United States.
Answers (1)
Trees in deciduous forest do what? A. Shed leaves during one season B. Grow in a warm Mediterranean climate C. Have needlelike leaves D. Grow in a climate that is cold year round
Answers (1)
How many miles long is the great wall of china
Answers (1)