Marine Institute

Other Marine Questions & Answers

The following questions and answers cover other marine topics such as plants, algae, tides, and more.

What makes the tides?

Tides are caused by the gravitational pull of the moon, sun and earth. The pull of the moon causes oceans to "bulge out" in the direction of the moon and this causes an equal and opposite bulge on the opposite side of the earth.  This means that a high tide occurs at the same time on opposite sides of the earth.

How many high and low tides are there in a day (24 hrs)?

Twice a day tides make the sea level rise and fall.

How deep is the sea?

The deepest part of the sea is approximately 11 kilometers deep. This area is known as the “Challenger Deep”.