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In practice, the population mean is used to estimate the sample mean
Glaciers
Large masses of ice that move slowly over land, formed by the accumulation and compaction of snow, and can shape landscapes through erosion.
Lakes
Large bodies of water surrounded by land, usually freshwater, but they can also be salty in some regions.
Groundwater
Water that is found underground in the cracks and spaces in soil, sand, and rock, which can form aquifers from which water can be extracted for use.
Ice Caps
Large mass of ice that covers less than 50,000 square kilometers of land area, usually found in high-latitude regions; smaller than ice sheets.
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