Ice moves ________ in the zone of accumulation and ________ in the zone of wastage
A) downward, upward
B) downward, downward
C) upward, downward
D) upward, upward
Answer: A
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Otto Hahn and Fritz Strassmann discovered fission by bombarding uranium with neutrons. Their discovery was made possible by finding one of the fission products, barium (Ba, atomic no. = 56). What is a reasonable explanation for why they were unable to initially observe the other product, krypton (Kr, atomic no. = 36)?
A. The isotope of krypton generated might have a short half-life and had undergone radioactive decay to some other element. B. Krypton is a noble gas and therefore chemically unreactive, making it difficult to characterize by chemical means. C. Krypton is a noble gas and it may have diffused out of the sample. D. both A and B E. all of the above
Which of the following is true about the Pineapple Express?
A. It causes nor'easters to form. B. It brings heavy rainfall to the West Coast. C. It is part of the polar jet stream. D. It is caused by El Niño.
Humus
A. helps to form pores that help aerate the soil. B. decreases the pH of the soil. C. is formed from organic matter. D. All of the statements are correct.
Before the appearance of cells capable of sexual reproduction, ____
A)there was no life on Earth B)evolution was comparatively slow C)evolution was comparatively fast D)cells could not reproduce E)multicelled organisms existed