Glacier

 A glacier is a large, perennial accumulation of crystalline ice, snow, rock, sediment, and often liquid water that originates on land and moves down slope under the influence of its own weight and gravity.

A glacier is a persistent body of dense ice that is constantly moving under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries.

Series: Types of Glaciers

• Ice Sheets. 
• Ice Fields and Ice Caps. 
• Cirque and Alpine Glaciers. 
• Valley and Piedmont Glaciers. 
• Tidewater and Freshwater Glaciers. 
• Rock Glaciers.

Fedchenko Glacier, also spelled Fedčenko, extensive valley glacier, situated in the Central Asian Pamirs range, central Tajikistan. The world's largest glacier found outside the polar regions, it is about 45 miles (70 km) long and covers up to some 350 square miles (900 square km).

Siachen is the longest glacier in India. It is 78km long and the source for the Nubra River that waters the Nubra Valley near Leh in the Trans Himalayas. It is the Second-Longest glacier in the World's Non-Polar areas.

The highest glacier in the world is The Khumbu Glacier (Nepali: खुम्बु हिमनदी) is located in the Khumbu region of northeastern Nepal between Mount Everest and the Lhotse-Nuptse ridge. With elevations of 4,900 m (16,100 ft) at its terminus to 7,600 m (24,900 ft) at its source, it is the world's highest glacier.

The age of the oldest glacier ice in Antarctica may approach 1,000,000 years old.

The age of the oldest glacier ice in Greenland is more than 100,000 years old.

The age of the oldest Alaskan glacier ice ever recovered (from a basin between Mt. Bona and Mt. Churchill) is about 30,000 years old.

According to the GLIMS data set, the three largest glaciers in the world are Vatnajokull Glacier in Iceland, Flade Isblink Ice Cap in Greenland, and Seller Glacier in Antarctica.

Gem Glacier is the smallest named glacier in Glacier National Park (U.S.).