Ocean currents

What causes water to become more dense?

• Hot levels of salt and hot temperature.

• High levels of salt and cold temperature.

• High levels of sugar and hot temperature.

• Hot levels of sugar and cold temperature.

What are density currents?

• The vertical movement of water caused by differences in density.

• The horizontal movement of water caused by differences in density.

• The vertical movement of water caused by similarities in density.

• The horizontal movement of water caused by similarities in density.

Do ocean currents flow at different depths in the ocean?

• No

• Yes.

• Maybe

Do density currents move water downwards?

• No.

• Maybe.

• Yes.

What are surface currents?

• They are heat-driven occurences that carry ocean water horizontally across the ocean’s surface.

• They are earth-driven currents that carry ocean water horizontally across the ocean’s surface.

• They are water-driven occurences that carry ocean water horizontally across the ocean’s surface.

• They are wind-driven currents that carry ocean water horizontally across the ocean’s surface.

What’s upwelling?

• It’s the horizontal movement of water towards the oceans’ surface and pushes water away from an area.

• It’s the vertical movement of water towards the oceans’ surface and pushes water away from an area.

• It’s the vertical movement of water towards the oceans’ depth and pushes water away from an area.

Is the water that’s deep and cold forced to the surface by upwelling?

• Yes

• Maybe

• No

What are some characteristics of deep cold water?

• It’s rich in nutrients and supports large populations of algae, fish and other ocean organisms.

• It’s poor in nutrients and supports small populations of algae, fish and other ocean organisms.

• It’s low in nutrients and supports high populations of algae, fish and other ocean organisms.

What are gyres?

• They are medium straight systems of ocean currents.

• They are small circular systems of ocean currents.

• They are large circular systems of ocean currents.

• They are large straight systems of ocean currents.

How is the Global Conveyor Belt formed?

• With the combination of surface currents, upwellings and density currents.

• With the release of surface currents, upwellings and density currents.

• With the trading of surface currents, upwellings and density currents.