The pair of mallard ducks in the figure eats floating plants such as duckweed, seeds of shoreline plants, and very small organisms at or near the surface. They would be most affected by any change to the ________.
Fill in the blank(s) with the appropriate word(s).
Answer: littoral or limnetic zones
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The southern hemisphere's summer solstice occurs
A) at the same time as the northern hemisphere's summer solstice.
B) on or around June 21.
C) on or around December 21.
D) during the northern hemisphere's equinox.
A self-amplifying reaction and a nuclear explosion in a nuclear power plant are prevented in large part by
A) the regular addition of uranium-239 to the fuel. B) control rods that absorb extra neutrons. C) the production of plutonium-239. D) fuel rods that absorb tremendous amounts of heat.
Briefly describe the scientific process outlined in this chapter.
What will be an ideal response?
When considering evidence of glaciation on the southern continents, why did Wegener reject the explanation that the entire planet had experienced a period of extreme cooling?
A) Because the glacial debris was localized to a few small mountain valleys B) Because he knew the "glacial debris" was actually a misinterpreted landslide C) Because geologic evidence supported the existence of tropical swamps in the Northern Hemisphere D) Because the 16O/18O ratios in fossils supported an ice-free period