These glaciers are the most dangerous to man, because they contain holes and sometimes leak, causing floods and the occasional avalanche. It is not uncommon to see flat ground, valleys and holes formed by the scraping of a glacier. Vegetation often disappears when a glacier is moving across land, and reappears in different forms when the glacier has left. These areas are of great interest to scientists, because they can give clues about the early geological formation of the earth. Scouring glaciers for evidence of evaporation, wind damage, acid rain and erosion are ways in which scientists can ascertain information about our planet.
Glaciers are also very important to the stability of the environment.
Changes in heat and atmosphere can cause glaciers to melt, change shape and move more rapidly. Bodies of water change in response to glacier evaporation and melting. The faster a glacier moves, the more land is reforms in its movement. For these reason, it is important that scientists monitor glacier movement and water flow. Glacier determine a large part of our natural environment, and will continue to do so far into the future.