The formation of shell mounds in Australia is a common practice across northern Australia from what time?Question 3Answera.10,000b.7,000c.15,000d.2,500

The formation of shell mounds in Australia, particularly in northern Australia, is a significant aspect of Aboriginal cultural practices. Archaeological evidence suggests that these shell mounds date back to around 7,000 years ago. Therefore, the correct answer to your question is option b. 7,000.

These shell mounds, known as "middens," are typically formed by the accumulation of discarded shells from seafood consumption, reflecting the dietary practices of Indigenous Australians and their long-term habitation in these areas. The study of these formations provides valuable insights into the environmental changes and human activities over thousands of years.