Australasia: Add brief definition or description
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- Earth science : The study of the components and processes of the planet Earth.
- Continent : An extended part of the Earth's crust that extends above sea level.
- Oceania : A major geographical region of the planet Earth, mostly in the southern hemisphere, consisting of Australasia (the Australian continent and New Zealand), Micronesia, Melanesia and Polynesia.
- Australia : Continent in the Southern Hemisphere and the federal parliamentary nation that occupies it.
- New Zealand : Country in the South Pacific; constitutional monarchy and a member of the Commonwealth of Nations.
- Africa : Continent stretching over the equator, hosting deserts, tropical jungles and savannah as well as over fifty nations; population about 900,000,000.
- Antarctica : The Earth's southernmost continent, located almost entirely south of the Antarctic Circle; covers the South Pole.
- Arctic : The region of the Earth so far north that at least one day of the year the sun is below the horizon
- Asia : The largest continent in both land area (with 30% of Earth's land area) and population (with 4 billion people, or 60% of Earth's population).
- Europe : Sixth largest continent; area 10,000,000 km2; pop. 720,000,000
- North America : The third largest continent; area 24,709,000 km² ; pop. 523,736,000 (est. July 2007)
- South America : The fourth largest of the Earth's continents, one of the pieces that broke up from the former supercontinent Gondwana.