Worldwide, coral reefs provide habitat for about 25% of all marine organisms. However, coral reefs occupy about _____ of the ocean floor
a. 25%
b. 10%
c. 15%
d. 5%
e. 0.2%
E
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The oceanic crust has an average age of ________ and a maximum age of ________
A) 200 million; 400 million B) 80 million; 200 million C) 100 million; 180 million D) 90 million; 300 million
Volcanic eruptions are one of the few natural hazards that have no benefit to humans
Indicate whether the statement is true or false
The world population growth rate is currently close to ________%
A) 1.2 B) 2.5 C) 5 D) 10 E) 20
Recall that the littoral zone is the area between high and low tides (also called the intertidal zone), and the sublittoral zone extends from the low-tide shoreline out to a depth of 200 meters (600 feet; also called the shallow subtidal zone)
Why are sessile, plant-like macroalgae (i.e., those attached to the ocean bottom) only found in littoral and sublittoral environments? a) They need rocks for attachment, and rocks are not found in the deep-sea. b) They need nutrients that are found only in the littoral and sub-littoral zones. c) They cannot survive in clear waters offshore because of excessive solar ultraviolet radiation. d) They require light to reach the ocean bottom, which only occurs in these two zones. e) They need to live in an area where wave energy reaches to the seafloor, which only occurs in these two environments.