Ocean and Seas

What are the two main types of ocean currents?

• warm currents and cold currents

• tidal currents and thermohaline currents

• horizontal currents and vertical currents

• surface currents and deep water currents

Which type of ocean current flows along the surface of the ocean?

• Surface currents

• Underwater currents

• Deep currents

• Subsurface currents

Which type of ocean current flows deep beneath the surface of the ocean?

• undercurrent

• deep ocean current

• subsurface current

• submarine current

What are marine ecosystems?

• Terrestrial ecosystems found in forests and grasslands.

• Freshwater ecosystems found in rivers and lakes.

• Atmospheric ecosystems found in the air and clouds.

• Aquatic ecosystems found in oceans, seas, and other saltwater environments.

Name one example of a marine ecosystem.

• Kelp forest

• Mangrove swamp

• Tropical rainforest

• Coral reef

What are oceanic trenches?

• Deep, narrow depressions formed by volcanic activity.

• Mountain ranges formed by the collision of tectonic plates.

• Shallow, wide depressions formed by subduction of tectonic plates.

• Long, narrow depressions formed by subduction of tectonic plates.

Which oceanic trench is the deepest known trench on Earth?

• Mariana Trench

• Philippine Trench

• Java Trench

• Kermadec Trench

What are seafloor features?

• Physical characteristics of the ocean floor

• Methods of deep-sea exploration

• Types of fishing nets

• Underwater plants and animals

Name one seafloor feature.

• Trenches

• Mid-ocean ridges

• Seamounts

• Continental shelves

What is oceanic circulation?

• The movement of ocean waters around the globe.

• The formation of waves and tides in the ocean.

• The growth and development of marine organisms in the ocean.

• The process of water evaporating from the ocean surface.