Oceans Overview

Which factor does NOT influence the chemical composition of seawater?

• Location
• Depth
• Wave action
• Sunlight exposure

At what depth does the Abyssopelagic zone begin?

• 2000 meters
• 4000 meters
• 6000 meters
• 10,000 meters

How does the increase in carbon dioxide in the atmosphere affect the pH of the oceans?

• it decreases the pH
• It makes the water saltier
• it does not affect the ph
• it increases the pH

What is the freezing point of seawater in degrees Celsius?

• 2°C
• -2°C
• -4°C
• 0°C

What device do oceanographers use to learn about the topography of the ocean floor?

• sonar
• LIDAR
• radar
• GPS

Which zone is referred to as the "Midnight zone"?

• abyssopelagic
• Epipelagic
• Bathypelagic
• Mesopelagic

What is the average salt content of seawater?

• 35 parts per thousand
• 45 parts per thousand
• 55 parts per thousand
• 25 parts per thousand

What is the average global pH level of ocean water?

• 7.5
• 6.5
• 7.0
• 8.1

Why does the salinity of seawater not increase despite continuous addition of salt ions?

• the water temperature decreases
• the water becomes less dense
• winds remove salty droplets
• more fish consume the salts

What is the primary reason why deeper ocean zones absorb more light?

• the water is colder at deeper depths
• oceans are deep and light diminishes with depth
• there is less marine life at deeper depths
• light travels further in deeper water