Ineed catching up my assignments.

1. there is less oxygen in density currents than in surface currents.

true or false?

2. which pair of factors would both cause salinity to increase?

a: freezing of sea water and precipitation
b: melting sea ice and evaporation
c: evaporation and freezing water
d: precipitation and melting sea ice

3. sinking volcanic islands and developing coral reefs are related to the formation of

a: deep sea trench
b: abyssal hills
c: atolls
d: manganese nodules