Great Barrier Reef Ecosystem Insights

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 thousands of marine species and various coral types. Corals, along with red algae, form the reef's structure by extracting calcium carbonate. The reef is home to numerous mollusks and serves as a nesting ground 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. Conservation efforts aim to preserve this natural wonder, which has a history dating back 500,000 years.

What is the Great Barrier Reef often compared to due to its vibrant ecosystem?

• A savannah

• A rainforest

• A desert

• A mountain range

How do coral animals contribute to the reef's structure?

• By producing oxygen

• By extracting calcium carbonate

• By consuming algae

• By filtering water

What role do encrusting red algae play in the reef ecosystem?

• They act as predators

• They produce coral larvae

• They provide food for fish

• They cement the reef structure

Which of the following is NOT a type of mollusk found in the Great Barrier Reef?

• Sea horses

• Nudibranchs

• Giant clams

• Sea slugs

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

• To escape predators

• To find mates

• To lay their eggs

• To feed on coral

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

• 1990

• 1981

• 2000

• 1975

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

• 10%

• 75%

• 33%

• 50%

What is a major threat to the Great Barrier Reef mentioned in the transcript?

• Mining

• Urbanization

• Overfishing

• Deforestation

How old is the Great Barrier Reef estimated to be?

• 50,000 years

• 20,000 years

• 10,000 years

• 100,000 years

What evidence have geologists found regarding the age of ancient corals in the reef?

• They are 100,000 years old

• They are 250,000 years old

• They are 500,000 years old

• They are 1 million years old