Trees are important because they provide valuable commodities, including wood, paper, and fruit. However, forests are not distributed equally around Earth, and there are economic and social implications of some regions having more timber resources than others.
Astronomers describe the position of objects in the sky by using coordinates. ... The easiest way to do this is to use coordinate systems which assume that all objects in space are at the same distance, on the inside of an imaginary celestial sphere.
Monongahela River, Ohio River, and Allegheny River.
