The Sun has no effect on the world's oceans because it is to far away. True OR False
The density of seawater depends upon the temperature. The warmer the water is, the denser the water is. True Or False

Differences in help drive the flow of ocean water.

temperature

humidity

the number of fish in an area

moonlight

How does seismic reflection work?

The light waves are reflected by floating objects of known location

The light waves are reflected by mirrored material in the water.

The sound waves go around the planet and are timed

The sound waves penetrate and bounce off layers of the ocean bottom

What two properties of water affect the density of water in the oceans?

pressure and dissolved oxygen

pressure and temperature

temperature and dissolved oxygen

temperature and salinity

Fill in the blank. The oceans are warmer at the equator and colder at the poles. Water temperatures also vary with .

concentration

sight

polarity

depth

Below 200 meters the ocean is black. Why?

sediments are interfering with the transmission of light

shade from plants along the edges of continents

because no light reaches that depth

because kelp blocks the sunlight

Tides occur because moon's gravity pulls on the earth's oceans. True OR False