Photosynthesis:
A) releases oxygen into the atmosphere.
B) is carried out primarily by bacteria.
C) releases carbon dioxide into the atmosphere.
D) was prevalent during the first years of the earth's atmosphere.
A
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Nutrients in surface waters can become depleted following periods of rapid phytoplankton growth known as ------------Fill in the blank(s) with the appropriate word(s)
What texture is displayed by the igneous rock in this photograph?
A. breccia B. vesicles C. porphyritic D. glassy E. None of these.
Along which tectonic boundary will chains of composite cone volcanoes be located?
A) Convergent boundary B) Divergent boundary C) Transform boundary D) Mantle plumes
What is the "greenhouse gas" that is the most significant cause of what scientists have labeled global warming?
a. nitrogen dioxide b. hydrogen peroxide c. ferrous oxide d. carbon dioxide