Author Question: The increased presence of carbonic acid at deep depths causes calcium carbonate to precipitate into ... (Read 89 times)

lracut11 · **on:** Aug 22, 2018

The increased presence of carbonic acid at deep depths causes calcium carbonate to precipitate into a
solid beneath approximately 4500 meters. Indicate whether the statement is true or false.

Question 2

Clays can remain suspended in a water column for decades before settling due to their small size. Indicate whether the statement is true or false.

shewald78 · **Reply #1 on:** Aug 22, 2018

Answer to Question 1

ANS: F
The increased presence of carbon dioxide at deep depths translates into more carbonic acid. The
acidity compounded with increased solubility at cold temperatures causes calcium carbonate to
dissolve at faster rates than normal. This is why calcareous oozes do not form below the calcium
carbonate compensation depth (about 4,500 meters). Information can be found in the section Pelagic
Sediments Vary in Composition and Thickness.

Answer to Question 2

ANS: T
Some of the finest clays just circulate throughout the ocean. Eventually, these particles will stick
together a bit and sink to the bottom. Information can be found in the section Sediments May Be
Classified by Particle Size.