Ocean Quiz

What percentage of Earth's surface is covered by the ocean?

• 90%

• 75%

• 100%

• 50%

Which layer of the ocean receives very little sunlight and cannot support photosynthesis?

• Sunlight layer

• Abyssal layer

• Twilight layer

• Midnight layer

What is the primary tool used by scientists to explore the ocean?

• Satellite

• Research vessel

• Sonar

• Submarine

What is the most common form of mining at sea?

• Exploring

• Excavating

• Dredging

• Drilling

What percentage of the world's protein is supplied by fish and shellfish caught by fishing vessels?

• 25%

• 16%

• 10%

• 5%

Which ecosystem is often destroyed by tourism development in coastal areas?

• Kelp forests

• Mangrove swamps

• Salt marshes

• Coral reefs

What do ocean currents help move around the globe?

• Heat

• Clouds

• Minerals

• Water vapor

What do phytoplankton convert dissolved carbon dioxide into?

• Oxygen

• Water vapor

• Food

• Carbon monoxide

Which layer of the ocean is known as the hadal layer?

• Midnight layer

• Twilight layer

• Sunlight layer

• Abyssal layer

What is the primary source of food for ocean food chains?

• Plankton

• Phytoplankton

• Seaweed

• Fish