1) They support one of the lowest population densities in the United States
2) Occupy around 500,000 miles of west-central North America
3) Millions of American bison roamed the Great Plains before their near-extermination by market hunters in the late 1800s
4) Through dedicated conservation efforts, bison have made an impressive comeback both on public and private lands.
5) Along wildlife other than bison were pronghorn, elk, mule deer, white-tailed deer, etc.
6) Cast in the rainshadow of the Rockies, the Great Plains harbor the greatest remaining expanses of prairie, a highly-endangered habitat, in the country.
7) While many presume the Great Plains to be relentlessly level, the province actually contains much topographic variety.
8) There are island mountain ranges, especially on the Missouri Plateau---the Bears Paw Mountains, the Sweetgrass Hills, the Black Hills, for example.
9) The Great Plains of interior North America constitute one of the largest grassland expanses in the world
10) For thousands of years, human cultures as varied as the Kiowa, the Blackfeet, the Spanish and the Americans have explored, hunted, settled and fought over these vast spaces.
the process by which Earth makes heat is called radioactive decay. it involves the disintegration of natural radioactive elements inside Earth. ex; uranium is a special kind of element because when it decays, heat is produced from it
