Based on its abundance in Earth's crust, most rocks contain a mineral composed of the elements oxygen and
A. iron.
B. carbon.
C. silicon.
D. sulfur.
Answer: C
Environmental & Atmospheric Sciences
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By 2025, demographers predict that what percentage of the world will be living in urban areas?
A) about 60% B) approximately 30% C) at least 50% D) a little less than 70% E) almost 90%
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The unsaturated zone above the water table is also known as the ________
Fill in the blank(s) with correct word
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The East Africa Rift Valleys are an example of ________ plate boundary
A) a continental transform B) a continental-continental convergent C) a continental-continental divergent D) an oceanic-continental convergent E) an oceanic-oceanic divergent
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Which developed nation has not signed the Kyoto Protocol?
A. Japan B. Germany C. USA D. France
Environmental & Atmospheric Sciences