Great Barrier Reef: An Underwater Ecosystem of Life and Diversity

The Great Barrier Reef, visible from space, is the largest living structure on Earth, stretching over 2,000 kilometers along Australia's east coast. It hosts a diverse ecosystem, comparable to a rainforest, with numerous marine species and coral types. Corals form the reef's structure, aided by red algae. The reef is home to thousands of mollusks and is a crucial site for green sea turtles. Established as a national park in 1975 and a World Heritage site in 1981, the reef faces challenges from pollution, overfishing, and climate change. Despite being 20,000 years old, ancient corals suggest a much older history. Conservation efforts aim to preserve this natural wonder for future generations.

What is the Great Barrier Reef primarily known for?

• Being a massive living structure visible from space

• Being the longest river

• Being the tallest mountain range

• Being the largest desert on Earth

How many types of habitats does the Great Barrier Reef host?

• Less than 10

• More than 70

• Exactly 50

• Around 30

What do coral animals extract from the water to build their structures?

• Silicon dioxide

• Calcium carbonate

• Magnesium sulfate

• Sodium chloride

What role do red algae play in the reef's construction?

• They cement fragments with calcium carbonate

• They produce oxygen

• They provide food for fish

• They act as predators

Approximately how many kinds of mollusks are found in the Great Barrier Reef?

• Exactly 1,000

• About 500

• More than 4,000

• Less than 100

Why do green sea turtles travel to the Great Barrier Reef's islands?

• To escape predators

• To hunt for food

• To find mates

• To lay their eggs

When was the Great Barrier Reef established as a national park?

• 1990

• 1965

• 1980

• 1975

What percentage of the Great Barrier Reef is fully protected from fishing?

• 50%

• 10%

• 33%

• 75%

How old is the Great Barrier Reef estimated to be?

• 10,000 years

• 100,000 years

• 20,000 years

• 50,000 years

What have geologists discovered about the ancient corals in the Great Barrier Reef?

• They are only a few hundred years old

• They are half a million years old

• They are the youngest corals on Earth

• They are not made of calcium carbonate