How deep is ocean

Label the four ocean basins marked with numbers.

a

b

c

d

Indian Ocean

Atlantic Ocean

Arctic Ocean

Pacific Ocean

What percentage of Earth's surface is covered by the ocean, and what percentage of Earth's biosphere does it contain?

• 50% surface, 75% biosphere

• 71% surface, 99% biosphere

• 60% surface, 90% biosphere

• 80% surface, 95% biosphere

What is the name of the uppermost layer of the ocean where there is enough sunlight, and what is its approximate depth range?

• Twilight Zone, 650 to 3,300 feet

• Midnight Zone, 3,300 to 13,100 feet

• Sunlight Zone, 0 to 650 feet

• Abyssal Zone, 13,100 to 19,700 feet

Which ocean zone is characterized by fading sunlight and extends from approximately 650 feet to 3,300 feet below the surface?

• Sunlight Zone

• Twilight Zone

• Midnight Zone

• Abyssal Zone

What is the deepest point known to humans in the ocean, and where is it located?

• Challenger Deep, off the coast of Japan

• Mariana Trench, near the Arctic Ocean

• Hadalpelagic Zone, off the coast of Africa

• Abyssal Plain, near South America