Question 2 of 21

Which of the following countries is the most densely populated?

... As of 2006, Bangladesh had about 2,600 people per square mile.

Question 3 of 21

Where do most of the planet's land animals live?

... About 70 percent of land animals live in forests.

Question 4 of 21

What was one result of the last ice age?

... As a result of the last ice age 21,000 years ago, sea level rose about 394 feet (120 meters).

Question 5 of 21

About how much of the surface of the Earth is covered in land?

... Almost 30 percent of the Earth is covered in land. That leaves about 70 percent water!

Question 6 of 21

Which marine creature changes its sex several times during its life?

... A parrot fish can switch back and forth from male to female throughout its life.

Question 7 of 21

The artificial island now known as Sealand was originally built for what purpose?

... During World War II, the British built a water-based gun tower known as HM Fort Roughs, which was later abandoned, occupied and renamed "The Principality of Sealand."

Question 8 of 21

Who conducted training inside the Aquarius underwater laboratory in 2010?

... In anticipation of NASA's return to the moon, astronauts used the Aquarius as a training site.

Question 9 of 21

How can the use of wind turbines affect local weather?

... Wind power can increase local temperature and evaporation level.

Question 10 of 21

Why is a seahorse poorly suited for life in the ocean?

... It is a poor swimmer, using one small dorsal fin to propel itself.

Question 11 of 21

Hypothetically, how might microwaves beamed from satellites affect weather?

... Some scientists believe that microwaves can be used to disperse a tornado.

Question 12 of 21

What is happening to the world's human population?

... The population of the planet is still increasing, but at a reduced rate when compared to the rate of increase during the 20th century.

Question 13 of 21

How long can nuclear submarines remain submerged?

... Nuclear subs like those of the U.S. Navy can stay underwater for months at a time, making their own oxygen and fresh water.

Question 14 of 21

Which island micronation is owned by the Segway inventor?

... Dean Kamen owns the Kingdom of North Dumpling Island, which is actually under the jurisdiction of New York State.

Question 15 of 21

What is one solution to the offshore eyesore problem of turbines?

... Floating platforms may be able to support wind turbines much farther offshore.

Question 16 of 21

Which water plant did the BioSub marine biologist Lloyd Godson use to supply oxygen in his underwater environment?

... On his last day in the BioSub, the scientist even ate some of the algae that provided him with oxygen.

Question 17 of 21

Which country supplies most of the world's aquaculture commodities?

... China provides 80 percent of the world's aquaculture supplies.

Question 18 of 21

What type of organism are corals?

... Coral reefs are formed by tiny animals.

Question 19 of 21

Why do astronauts practice for space flights underwater?

... Using specific equipment, astronauts can simulate weightlessness and confinement in water.

Question 20 of 21

The beaver dam visible from space is located in what country?

... The 2,800-foot-long (850-meter-long) beaver dam is in northern Canada.

Question 21 of 21

Why are escaping fish a significant problem on fish farms?

... Farm fish that get into the wild breed with wild fish and alter the gene pool.

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