Coral reefs

The first coral reefs formed on Earth _____. That’s before the dinosaurs were alive!

• 240 million years ago.

• 2400 million years ago.

• 24000 million years ago.

• Coral reefs aren't real

• –Most coral reefs today are between ________ years old.

• • 500 and 1,000

• 5 and 10

• • 5,000 and 10,000

• nobody knows

There are more than _______ different types of hard coral around the world.

• 2

• 1,00000000

• 632

• 800

Where can you find the world’s largest coral reef system?

• Japan

• Australia

• Brazil

• Hawaii

Why are coral reefs often called the “rainforests of the sea”?

• Because they have tall plants

• Because they are warm and wet

• Because they support a lot of marine life

• Because it rains there a lot

What color are healthy corals?

• White

• Brown

• Black

• Bright colors (like pink, purple, yellow)

Which of these human activities is harmful to coral reefs?

• Overfishing

• Pollution

• Climate change

• All of the above

Approximately what percentage of the ocean floor do coral reefs cover?

• 1%

• 10%

• 50%

• 25%

Why are coral reefs important for humans?

• They provide food and medicine

• • They protect coastlines from storms

• They are a source of tourism

• All of the above

Which of the following animals is often found living in coral reefs?

• Polar bears

• Clownfish

• Penguins

• Wolves