Q:

Where do avalanches occur most frequently?

A:

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.

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Full Answer

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.

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    How do avalanches occur?

    A:

    Avalanches occur when masses of snow, often with ice and debris, slide down mountain sides. They are triggered by overloading, snow pack conditions, slope angle, vibration and temperature. They gain speed and power as they draw nearer to the bottom of the slope.

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    Where do droughts occur?

    A:

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