Heavy elements like Pb (lead) and U (Uranium) were generated ________
A) by the Sun and expelled to the solar system via the solar wind
B) during the big band when the universe was formed
C) during collapse of a star and subsequent nuclear synthesis in a supernova
D) by humans in nuclear reactors
C
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In Mediterranean climates such as in parts of California, Australia, and South Africa, frequent wildfire is necessary for the health of natural plant communities.
Answer the following statement true (T) or false (F)
Wildfire can be said to ________
A) be a small effect worldwide B) be mainly limited to desert climates C) occur only in climax communities D) be necessary for some plant communities to thrive E) cause most of the plant diversity in an area
Why is waste disposal a significant problem in nuclear power generation? Discuss Yucca Mountain
What will be an ideal response?
Which of the following landform definitions is CORRECT?
a. The taiga is a treeless area between the treeline and Arctic regions. b. The tundra is an area of coniferous forests. c. Permafrost areas suffer from continue drought. d. Steppes are semi-arid grasslands.