We are certain that the Earth's climate is changing because of the trends that we see in the instrumented climate record and the changes that have been observed in physical and biological systems. The instrumental record of climate change is der
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.
Definitions of often used glaciology and glacial geology terms can be found at the USGS Glacier Photoglossary Web site.
The link between land use and the climate is complex. First, land cover, as shaped by land use practices, affects the global concentration of greenhouse gases.
While there is no global standard for what size a body of ice must be to be considered a glacier, USGS scientists in Glacier National Park use the commonly accepted guideline of 0.1 square kilometers (about 25 acres) as the minimum size of a glacier.
What would happen if the temperature in the world rose enough to melt all the snow and ice at the North and South Poles?
No one knows for sure what would happen if the snow and ice in the polar regions all melted. Sea level would rise, which would flood coastal regions. Climate would be affected worldwide.
No, it does not. The term actually refers to changes in the position of the glacier’s terminus over a period of time. Like water, ice flows down its surface gradient and never goes back up valley.
In addition to qualitative methods like Repeat Photography, USGS scientists in Glacier National Park collect quantitative measurements of glacier area and mass balance to track how some o
What are "Benchmark Glaciers" and what are the scientific objectives of the USGS "Benchmark Glaciers" Program?
The term “Benchmark Glaciers” refers to three North American glaciers that have been selected to be the subjects of a long-term glacier monitoring program which investigates climate, glacier geometry, glacier mass balance, glacier motion, and stream ru
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