Where is there no deep scattering layer present?
a. Temperate oceans
b. Tropical oceans
c. Arctic oceans
d. All oceans have a deep scattering layer
ANS: C
The Arctic does not have a deep scattering layer. Perhaps this is due to the abundance of nutrients in
the deep water and the waters above. Information can be found in the section Examples of Marine
Communities.
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A ________ is an area organized into a political unit and ruled by an established government that has control over its internal and foreign affairs
A) nation B) state C) province D) territory E) continent
Of the following, which is the most likely source for coarse particulate matter?
A) power generation B) residential fireplaces C) fossil fuel combustion in vehicles D) cars driving on unpaved roads
Until about 10,000 years ago, our ancestors lived by hunting and gathering or __________
Fill in the blank(s) with correct word
Which of the following is an example of a small circle?
A. Tropic of Cancer B. Prime Meridian C. Equator D. International Date Line