Unit 3 Test Review

What is density?

• It measures how much mass/matter/material there is within a given space/volume of an object.

• It measures how much salt there is within the ocean.

• It measures the mass plus the volume in an object.

• It measures the perimeter, area, volume, and mass of an object.

Why does ocean water have a greater density than freshwater?

• Ocean water has a small salt concentration in comparison to freshwater. The lower the salinity, the higher the density.

• Ocean water is not denser than freshwater. They have equal density values.

• Ocean water has a large salt concentration in comparison to freshwater. The higher the salinity, the higher the density.

• Ocean water is a lot warmer than freshwater. The lower the temperature, the higher the density.

Water does NOT move along the layers with the same density.

• True

• False

How do the densities of lower temperature and higher temperature water compare?

• Lower temperature (cooler) = Lower density; Higher temperature (warmer) = Higher density

• Lower temperature (cooler) = Higher density; Higher temperature (warmer) = Lower density

• Lower temperature and higher temperature water have the same density.

How do the densities of lower salinity and higher salinity water compare?

• Lower and higher salinity concentrations have the same density.

• Lower salinity = Higher Density; Higher salinity = Lower density

• Lower salinity = Lower Density; Higher salinity = Higher density

Is it possible for water with higher salinity to rest on top of water with lower salinity? How?

• Yes; the water with higher salinity must be warmer than the water with lower salinity since warmer water is less dense.

• Yes; the water with higher salinity must be cooler than the water with lower salinity since cooler water is less dense.

• Yes; the water with higher salinity must be warmer than the water with lower salinity since warmer water is more dense.

• No, this is not possible

What does Earth's conveyor belt do?

• Transports warm water from the poles toward the equator and cold water from the equator to the poles.

• Allows the warm water in the equator to stay in the equator, and cold water in the poles to stay in the poles.

• Allows the warm water in the poles to stay in the poles, and cold water in the equator to stay in the equator.

• Transports warm water from the equator toward the poles and cold water from the poles to the equator.

Would warmer currents be more shallow or deep?

• Shallow because cooler water means it is less dense so it will be closer to the surface.

• Shallow because warmer water means it is less dense so it will be closer to the surface.

• Deep because cooler water means it is more dense so it will be deeper.

• Deep because warmer water means it is less dense so it will be deeper.

How do ocean currents help regulate climates?

• By making only warm water travel around the Earth

• By making only cool water travel around the Earth

• They help spread the uneven distribution of solar radiation reaching Earth

What would happen if we did not have currents?

• Areas near the equator would be too hot and areas near the poles would be too cold. Less land would be habitable.

• Areas near the equator would be too cold and areas near the poles would be too hot. Less land would be habitable.