Approximately how much of the world's estimated oil and gas ...

[hubes95]

Approximately how much of the world's estimated oil and gas reserves can be found within the
  sediments of the continental margins?
  a. One-third
  b. One-half
  c. Two-thirds
  d. Three-quarters

Question 2

What is the calcium carbonate compensation depth?
  a. The depth at which calcium carbonate begins to precipitate into a solid.
  b. The depth at which a calcareous ooze can start forming.
  c. The depth at which calcium carbonate starts to dissolve.
  d. The depth at which seawater becomes less acidic.

[carolinefletcherr]

Answer to Question 1

ANS: C
It is estimated that two-thirds of the world's fossil fuel reserves are found in sediments on the
continental shelf. This includes 38 crude oil and 33 natural gas. Information can be found in the
section Marine Sediments Are Economically Important.

Answer to Question 2

ANS: C
The calcium carbonate compensation depth (CCD) is the depth at which the calcium carbonate
accumulates at the same rate as it dissolves. This depth is usually about 4,500 meters. Information can
be found in the section Pelagic Sediments Vary in Composition and Thickness.