Which physical factor, related to the formation of severe weather, has to do with the amount of water vapor in the air?

Humidity
Pressure
Temperature
Wind

Which statement describes the availability of carbon in the ocean and its use by marine processes?

The ocean is a carbon sink, with carbon being utilized by photosynthesis of phytoplankton.
The ocean is a carbon sink, with carbon lost due to the transpiration of marine algae.
The ocean is a carbon source, with carbon being utilized during thermocline formation.
The ocean is a carbon source, with carbon lost due to the respiration of marine mammals.