According to the Federal Highway Administration, there are 46,876 miles of interstate highway in the United States. The Interstate System was built with funds allocated to each state by a series of acts of Congress.
A:Cold deserts are deserts that experience low temperatures and long winters. They occur in the Arctic, the Antarctic and Greenland, as well as above the tree lines of mountain ranges. Average temperatures range from 28 to 39 degrees Fahrenheit in winter and 70 to 79 degrees in summer.
A:Different types of maps include climate maps, resource or economic maps, physical maps, political maps, road maps and topographical maps. Most maps have a compass rose that shows direction (north, south, east and west). They also have a scale used for estimating distances.
A:The National Graphic website offers updated satellite imagery as does the ArcGIS.com and EarthExplorer, which is presented on the U.S. Geological Survey website. Digital Globe also offers satellite imagery on its site. The company provides satellite mapping for military and industry use, including oil and gas exploration.
A:The word "Arctic" originates from the Greek word for "bear." The Arctic area encompasses more than 18 million square miles. Neanderthal remains found in the Arctic have been carbon-dated to thousands of years after it is generally thought that the Neanderthals existed.
A:Volcanoes are found where the tectonic places that make up the Earth's surface are either pushing together or pulling apart. They are also found away from plate boundaries at "hot spots," where magma pushes through the Earth's crust.
A:The northernmost point on Earth's surface is called the geographic North Pole. It is one of only two points, the South Pole is the other, at which the rotation of the Earth causes no lateral displacement, but only a rotation around a single point.
A:Mount Hood's official elevation has been set at various points throughout history. Modern sources point to three different heights: 11,249 feet (a 1991 measurement by the U.S. National Geodetic Survey), 11,240 feet (based on a 1993 scientific expedition), and 11,239 feet (a measurement of slightly older origin).
A:In geography, aspect denotes the compass direction in which the slope of a mountain faces. Aspect also describes flat land and refers to the direction one section of land faces with respect to another section. For example, a coastline has a westerly aspect if the sea is on the west.
A:Russia is located in both Europe and Asia. The European portion of Russia is separated from the Asian portion by the Ural Mountains. Two of the country's largest cities, Saint Petersburg and the capital city of Moscow, are located in European Russia.
A:The Mississippi River flows through just one country: the United States. Beginning at Lake Itasca in Minnesota, the river winds its way over 2000 miles through the center of the country before emptying into the Gulf of Mexico.
A:A wide range of animals live in the taiga, including thousands of insect species, hundreds of bird species, 130 species of fish, 85 species of mammals and a few species of amphibians and reptiles. The animal species living in the taiga have adapted to live in the cold climate or migrate to warmer areas during the long winter.
A:The four hemispheres of the Earth are the Eastern, Western, Northern and Southern hemispheres. The Equator, or 0 degrees latitude, divides the Earth into Northern and Southern hemispheres. At 0 degrees longitude, the Prime Meridian divides Earth into the Eastern and Western hemispheres.
A:The Asian continent is spread over approximately 2.8 billion hectares area of land. Covering about 22 percent of the global land area, Asia contains some of the most diverse selection of climates, ranging from tropical forests to temperate desert lands.