How long is it estimated to take the ocean's volume of water to circulate through the oceanic crust at
spreading centers?
a. 1 million years
b. 10 million years
c. 100 million years
d. 1 billion years
ANS: B
It is estimated that a volume of water equal to the volume of the world's ocean is thought to circulate
through the hot oceanic crust at spreading centers about every 10 million years. The heat and
chemicals released through this circulation process is thought to play an important role in the chemical
composition of the seafloor and even the atmosphere. Information can be found in the section The
Topography of Deep-Ocean Basins Differs from That of the Continental Margins.
You might also like to view...
The influenza virus is typically spread by
A. body fluid contact or airborne emissions. B. sharing needles. C. resistance to cleaning chemicals. D. body fluid contact only. E. airborne emissions only.
Inside a freely falling runaway elevator, your
A) acceleration is zero. B) apparent weight is zero. C) gravitational interaction with the Earth is zero. D) all of the above E) none of the above
Which environment is least likely to deposit sand?
a) sand dunes along a beach or in a desert b) channel of a meandering river c) beach along the ocean or lake d) delta along an ocean or lake e) open ocean away from land
Over 50 percent of the world's coastal mangroves forests have been destroyed.
Answer the following statement true (T) or false (F)