Continent - Any of the world's main expanses of land.
Ex. Africa, Asia, North America, Europe, Australia, South America, Antarctica)
Hemisphere - Division of a sphere into the northern and southern halves by the equator, or western or eastern halves of the poles.
Ex. Half of the world, 1/2, a side of the brain.
Environment - The natural world/conditions where plants and animals live in.
Ex. Habitat, territory, mother nature, ecosystem.
Region - An area or division, especially part of a country, with similar characteristics.
Ex. In Texas, the regions are: Mountains and Basins, Coastal Plains, Central Plains, and Great Plains.