France, Austria, Switzerland and Italy are the countries with the largest number of avalanches each year. The United States is the fifth highest country in terms of avalanche danger, most prominently in Colorado, Alaska and Utah.
Avalanches occur in regions that contain mountainous areas and claim over 150 lives each year throughout the world. Ninety percent of avalanches happen on slopes between 30 and 45 degrees, since snow does not generally accumulate on mountains with steeper slopes. Avalanches occur when the pull of gravity is stronger than the strength of the snow. They can be caused by vibrations, loud sounds or changes in temperature.Learn More
Tundra fires tend to occur naturally in the area, but climate change may also contribute to the greater intensity of recent phenomena. University of Illinois plant biology professor Feng Sheng Hu claims a dramatic, nonlinear relationship occurs between climate conditions and tundra fires that make dead vegetation more flammable and fire prone.Full Answer >
Abiotic factors are the non-living parts of an ecosystem. The abiotic factors of Antarctica are its low temperatures, small amount of precipitation and polar ice sheet. Abiotic factors work with the biotic, or living, factors to shape the ecosystem.Full Answer >
According to the University of Southern California, the two types of ocean currents are surface currents, also know as surface circulation, and deep water currents also called thermohaline circulation. These currents make up 10 percent and 90 percent of all the water in the ocean respectively.Full Answer >
The Earth is constantly spinning on its axis, allowing sunlight to shine on different areas of the Earth at different times of the day, creating daytime when the Sun hits a specific area. When the Sun is not shining on a specific area of the Earth, it is nighttime. Since the Sun does not hit all of the Earth at the same time, it is daytime in some parts of the world, while it is nighttime in others.Full Answer >