Ocean floor subducts under continents because
A) the ocean floor is made up of silica and magnesium and is more dense than continental material.
B) the weight of the continents is so great that they push the ocean floor material downward.
C) the ocean floor is made of silica and aluminum s and is heavier than continental material.
D) the ocean floor has a lower density and therefore sinks more easily.
A
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Which one of the following scenarios is most likely to result in a body of water becoming hypoxic?
A) The overharvesting of oysters that would have filtered nutrients from ocean water B) The overfishing of sharks C) The extraction of phytoplankton from the ocean to use as an ingredient in smoothies and health food drinks D) An oil tanker running aground and seeping thousands of gallons of oil into the ocean
The study of space is inseparable from the study of ________
Fill in the blank(s) with correct word
The number of people served by advanced wastewater treatment plants doubled between 1968 and the mid-1990s, but because the treatment plants _______________________, the quantity of waste emitted into the water after treatment ___________________ .
A. became so much more effective; decreased by about one-third B. became so much less effective; increased by about one-third C. remained ineffective; remained the same D. moderately improved; increased by 10%
Customs or folk customs most closely approximate a ________.
A. cultural region B. cultural trait C. cultural complex D. cultural realm