Oceans! C1.1 Teens

The oceans cover just over __________ of the planet. They are the Earth’s largest life-support systems.

• 30%

• 70%

About _______ of the oxygen we breathe is produced by the oceans.

• 70%

• 45%

An estimated _________ of all life on Earth is found in the oceans.

• 30%-50%

• 50%-80%

• 60%-90%

The world’s fisheries provide employment for ____________ people and food for billions.

• 3.7 million

• 37 million

• 307 million

The sea level has risen ________ over the past 100 years.

• 10 - 25cm

• 25 - 50cm

The largest living structure in the world is the Great Barrier Reef - a coral reef which measure around _________ kilometres in length.

• 500

• 2,600

• 1,700

There are many endangered species including whales, dolphins, sharks and turtles. As many as ______________ are killed each year for their meat.

• 1 million

• 100 million