Final answer:
Australasia consists primarily of Australia and the island of Papua New Guinea. Australia is an island continent with unique physical geography and cultural diversity. Tourism is the main economic activity in Australia.
Step-by-step explanation:
Australasia consists primarily of Australia and the island of Papua New Guinea, along with neighboring islands in the Pacific Ocean.
Australia is an island continent that is slightly smaller in physical area than the continental United States. It is characterized by low elevation highlands and the Great Dividing Range along its eastern coast.
Tourism is the number one economic activity in Australia, and it is divided politically into six states and two territories. The core population areas in Australia are located along the coast in the east, from Brisbane to Adelaide.