Glaciers are made up of fallen snow that, over many years, compresses into large, thickened ice masses. Glaciers form when snow remains in one location long enough to transform into ice. What makes glaciers unique is their ability to move. Due to sheer mass, glaciers flow like very slow rivers.
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The Visa Waiver Program (VWP) permits citizens of certain countries to visit the United States for motives of tourism or business, and for a period of less than 90 days it is not necessary to obtain a visa. However, there exist other restrictions. Not all the countries participate in the Visa Waiver Program (VWP). They can be eligible to visit the United States without a visa under the Visa Waiver Program if they are going for business, tourism or transit (during 90 days more or less).