Asia

Asia is the largest and most populous continent or region, depending on the definition. It covers 8.6% of the Earth's total surface area, or 29.4% of its land area, and it contains more than 60% of the world's human population.

Australia is often referred as the Land Down Under because it lies on the opposite side of the earth from Europe and North America.
Australia is unusual in many different ways. It is the smallest and flattest continent. Australia is the driest inhabited continent.
Australia also has many exotic animals that are found nowhere else. Australia has many unique plants too.

South America

South America is is a continent situated in the western hemisphere. Depending on source, South and North America are sometimes considered a single continent or supercontinent, while constituent regions are infrequently considered subcontinents. Geologically, almost all of mainland South America sits on the South American Plate. Geopolitically, all of Panama – including the segment east of the Panama Canal in the isthmus – is often considered a part of North America alone and among the countries of Central America.