Based on recent U.S. census data, what shape in an age-structure chart would best illustrate the effects of the baby-boom in the United States?
A. classic pyramid
B. wide base that narrows rapidly
C. narrow base and wide top
D. stable base with a slight bulge near the top
E. stable base with a slight bulge near the bottom
Answer: D
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Humus:a
is the material always comprising the topmost soil horizon. b. is dark, organic-rich material formed by bacterial decay. c. is leaf-litter. d. must include sediments. e. none of the above
Which of the following external processes are clearly active/evident in the image above?
In what way is the rock cycle intertwined with plate tectonics?
A) Plate tectonic processes control the rock forming processes prevalent at plate boundaries. B) Plate tectonic processes are directly responsible for weathering. C) Plate tectonic processes are responsible for the internal heat that causes metamorphism and melting. D) Plate tectonic processes are directly responsible for sediment deposition.
During what time period did dinosaurs exist on Earth?
A. Mesozoic B. Precambrian C. Paleozoic D. Cenozoic