What is the surface feature associated with a divergent tectonic plate boundary?
A. Continental arc
B. Deep-sea trench
C. Mid-ocean ridge or rift valley
D. Island arc
Answer: C
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Which substance is the most abundant primary air pollutant in the United States?
A) sulfur oxide B) any volatile organic compound C) nitrogen oxide D) carbon monoxide
How can a shift in environmental pH affect aquatic ecosystems? What protects these ecosystems in some regions?
What will be an ideal response?
Judge the following sentence according to the criteria given below: The curling crest in a plunging breaker occurs BECAUSE they are the best waves for surfing
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
Which of the following is not a principle of Ecosystem function?
A) Ecosystems are always open to gains and losses of matter and energy. B) Ecosystem change is inevitable and essential. C) Matter and energy are neither created nor destroyed. D) Ecosystem's processes are self-regulated by interactions among their living and nonliving components. E) Ecosystems have distinct boundaries that are influenced by the abiotic factors in the ecosystem.