Oceans Review

Density currents flow deep down in the ocean.

A gyre is a circular system of ocean currents

Slow-moving, cold currents may rise to the surface. This ____ of cold water carries nutrients to the surface.

The deep-water layer in the ocean is very warm.

Sea animals and plants use substances dissolved in Earth’s ____ to form bones and shells.

Which number identifies an abyssal plain?

Upwelling DISCOURAGES growth of plankton at the surface because it doesn not bring nutrient rich water up from the deep.

As seawater becomes more acidic, it is harder for marine organisms to use calcium to build shells and exoskeletons

How does the temperature of seawater affect the amount of O2 it contains?

What is the only area of the ocean which organisms who do photosynthesis can survive?

Surface currents are caused by

As carbon dioxide increases, the ocean’s water becomes _____.

Nutrients from deep-water environments are brought to the surface by surface currents.

How are some algal blooms harmful?

Earth’s rotation has no effect on ocean currents.

What concept is illustrated in the following figure?

Tides are caused by ____.

Which number identifies an ocean trench?

Earth’s oceans hold nearly ____ of the Earth’s water.

The highest point on a wave is its crest.

Which number identifies a continental shelf ?

Coriolis causes currents to turn to the right in the N. hemisphere, and to the left in the S. hemisphere.

The coldest, most dense water will:

The weather in an area near a warm-water current will be: