El Chichon appears to have had a greater impact on atmospheric temperatures than did Mount St. Helens
Indicate whether the statement is true or false
TRUE
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Which of the following statements best describes insect species as a group?
a. They have backbones. b. About two million species have been identified by scientists. c. They are resistant to extinction. d. They have skin or integument similar to mammals. e. They do not spread human diseases.
The absolute humidity of the air is expressed as a percent
Indicate whether the statement is true or false
Which of the following is NOT a greenhouse gas?
a. carbon dioxide b. methane c. water vapor d. nitrous oxide e. argon
Which feature on this figure formed after the two terranes were already joined?
A. sediment with fossils (F) B. the pluton (P) C. the overlapping sedimentary unit (O) D. All of these choices are correct.