Question

The Great Barrier Reef refers to

Options

• Coral formation

• Tidal waves

• Hill range

• Man-made walls

Answer 1

Coral formation

Explanation: The Great Barrier Reef is the world's largest coral reef system composed of over 2,900 individual reefs and  900 islands stretching for over 2,300 kilometres (1,400  mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). The reef is located in the  Coral Sea, off the coast of Queensland, Australia.