As Heezen and Tharp interpreted the ocean depth data, they identified what unusual feature that hinted at continental drift?
a) The oceanic ridges have a cleft, or rift, in the middle rather than a peak.
b) The oceanic ridges have a broad, flat top very much resembling a table top.
c) Ocean ridges are unique to the Pacific Ocean.
d) They discovered a chain of very tall volcanoes in the middle of the Atlantic Ocean that do not rise higher than the sea surface.
e) Ocean ridges abruptly stop after a few hundred kilometers and then start again after a few hundred more.
a) The oceanic ridges have a cleft, or rift, in the middle rather than a peak.
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DDT, C14H9Cl5, is a very effective insecticide. It is hazardous to other species, however, because it tends to accumulate in the food chain. Shown above is its chemical structure. Suggest why it remains on plants and in soils for extended periods of time.
What will be an ideal response?
What is the approximate population of Southwest Asia and North Africa?
A) 100 million B) 200 million C) 500 million D) 700 million E) 1 billion
Urbanization is ________
A) growth of populations in rural communities with the focus on growing your own food and supporting less technological advancements B) the centralization of human populations living in densely populated cities C) the development of technologies, market economies, and social and government structures D) cities that serve as centers of commerce and governance of humans E) settlements that support societies with governments, public buildings, laws, and taxes
Compare and contrast the preservation of the Amazon Basin and the Pantanal, both in Brazil.
What will be an ideal response?