Great Barrier Reef of Australia is

Options

A. Fossil remains of ancient coral
B. Coral reef that is under erosion and reduction
C. Growing coral reef
D. Coral reef without any living content .

Answer

**Step-by-Step Text Solution:**

1. **Identify the Location**: The Great Barrier Reef is located off the coast of Queensland, Australia. It is a prominent natural feature that can be seen from satellite images.

2. **Understand What a Reef Is**: A reef is primarily made up of colonies of coral polyps. These polyps are small, soft-bodied organisms that are the building blocks of coral reefs.

3. **Composition of Coral Reefs**: Coral reefs are formed by the accumulation of calcium carbonate, which is secreted by the coral polyps. This calcium carbonate structure provides the foundation for the reef.

4. **Biodiversity**: The Great Barrier Reef is known for its rich biodiversity, hosting a variety of species, including different types of coral polyps that come in various colors and shapes.

5. **Environmental Concerns**: Over time, the Great Barrier Reef has faced significant threats due to pollution and other environmental factors, leading to erosion and a reduction in its size and health.

6. **Conclusion**: Therefore, the Great Barrier Reef of Australia can be described as a coral reef that is currently under erosion and reduction due to various environmental pressures.

**Final Answer**: The Great Barrier Reef of Australia is a coral reef that is under erosion and reduction.

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