The upper surface of a water saturated zone within rock or soil is the? Which of the following statement is true about lagoons?

A lagoon is a type of a large lake.
Lagoons are created by earthquakes.
A lagoon is often saltier water.
Lagoons are only found in the Arctic Ocean.

The top of the water-saturated soil zone is the

Today, the ocean is
it was in the past.

Which of the following is a true statement?

The oceans replenish groundwater.
The oceans provide water for rivers and streams.
Lakes are only found in the Northern Hemisphere.
Coral reefs and sandbars create lagoons.

I think this is the last one