Ch. 16 Oceans Review

Every 1 kilogram of ocean water contains about 35 grams of

• calcium

• dissolved salts

• sulfur

• chloride ions

Wind causes most ocean waves, but underwater disturbances cause most

• tsunamis

• gyres

• troughs

• clams

When the sun, moon, and earth form a 90 degree angle we have __________________tides.

• spring

• neap

• normal

• fall

Which letter identifies the abyssal plain?

• A

• B

• C

• D

Tides are caused by

• winds

• gravitational pull

• density currents

• all of the above

Surface currents are caused by

• upwellng

• cold water

• warm water

• winds

Earth's _______________ may have formed from water vapor given off by volcanoes.

• continents

• soil

• oceans

• minerals

What percent of the ocean pollution is considered to be land based?

• 44%

• 33%

• 77%

• 87%

Once the atmosphere cooled enough, water vapor condensed and ________________ began to fall onto earth.

• dust

• percipitation

• lava

• ash

Which letter represents the mid-ocean ridges?

• A

• B

• C

• D