Hydrothermal vents are considered both a source and sink for ...

[CharlieWard]

Hydrothermal vents are considered both a source and sink for ocean salts. How can one factor both add and take away salt?
 
  a) As water interacts with hot rock, some materials are dissolved whereas others are deposited.
  b) Due to random variations in chemical reactions, salts are both deposited and dissolved in the vents.
  c) The dissolved material cycles round and round in the vents, first being precipitated and then dissolved, then repeating again and again.
  d) Hot vents give off material first as gas, which precipitates salt, only to be dissolved by fluids moving through the vent plumbing.
  e) The statement is incorrect. Hydrothermal vents are only a source for salts, not a sink.

Question 2

Which group of marine algae is the most productive?
 
  a) red algae
  b) diatoms
  c) green algae
  d) brown algae
  e) coccolithophores

[mmj22343]

Answer to Question 1

A

Answer to Question 2

B

[CharlieWard]

Thanks for the timely response, appreciate it

[laurnthompson]

Excellent