Soil temperatures in Death Valley, California, near the Nevada border, have been known to reach 90 of degrees Celsius.

Mary Cassatt's paintings of mothers and children are known for its fine linear rhythm, simple modelings, and harmonies of clear color.

The best American popular music balances a powerful emotions of youth with tenderness, grace and wit.

Fossils in 500-millions-year-old rocks demonstrate that life forms in the Cambrian period were mostly marine animals capable of secreting calcium to form shells.

Hot at the equator causes the air to expand, rise and flow toward the poles.

As many as 50 percent of the income from motion pictures produced in the United States comes from marketing the films abroad.

The walls around the city of Quebec, which was originally a fort military, still stand, making Quebec the only walled city in North America.

The ballad is characterized by informal diction, by a narrative largely dependent on action and dialogue, by thematic intense, and by stress on repetition.

Many gases, including the nitrogen and oxygen in air,  ...... color or odor.

Hubble's law states that the greater the distance between any two galaxies, ............... is their relative speed of separation.