Author Question: Orbitals of wind waves close to shore have elliptical orbits due to the proximity of the bottom. ... (Read 45 times)

tnt_battle · **on:** Aug 22, 2018

Orbitals of wind waves close to shore have elliptical orbits due to the proximity of the bottom.
Indicate whether the statement is true or false

Question 2

What is the calcium carbonate compensation depth? Briefly explain why calcareous oozes are not found below this depth.

Kimmy · **Reply #1 on:** Aug 22, 2018

Answer to Question 1

True

Answer to Question 2

The calcium carbonate compensation depth (CCD) is the depth at which the rate of calcareous sediments that are supplied to the seabed equals the rate at which those sediments dissolve. Although foraminifera and coccolithophores live in nearly all surface ocean water, calcareous ooze does not accumulate everywhere on the ocean floor. Shells dissolve by seawater at great depths because the water there is slightly more acidic. This is the result of increased carbon dioxide in the seawater at depth in comparison with surface waters. This acidity, combined with increased solubility of calcium carbonate in cold water under pressure, dissolves shells more rapidly. Therefore, below the CCD, the tiny skeletons of calcium carbonate dissolve on the seafloor, so no calcareous oozes accumulate. Calcareous oozes cover about 48 of the surface of deep-ocean basins.