What were the conditions in your hometown during the peak of the last ice-age, 21,000 years ago?
What will be an ideal response?
The answers will vary depending on location. Areas in Canada and the northern United States would have been covered with ice. The arid southwestern U.S. would not be a desert. Modern coastal towns would have been far from the ocean. Students should use information in maps and photos in sections 18.7–18.9 to justify their answers, or cite other sources that they located.
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Many species have provided medicines and products demonstrating that biodiversity has ________ value and should therefore be preserved
A) ethical B) entertainment C) aesthetic D) economic E) religious
The lowest crude birth rates are found in countries in which stage of the demographic transition?
A) Stage 1 B) Stage 2 C) Stage 3 D) Stage 4 E) none of these stages
Generally, the greater the mixing depth, the better the air quality
Indicate whether the statement is true or false
If the mantle has a density of 3000 kg/m3 and a section of crust has a density of 2000 kg/m3, what percent of the crust would stick up above the top of the mantle and what percent would stick down into the mantle?
What will be an ideal response?