What is the zone above the snowline on a glacier called Group of answer choices?
On a glacier, the accumulation zone is the area above the firn line, where snowfall accumulates and exceeds the losses from ablation, (melting, evaporation, and sublimation).
What are the three zones of a glacier?
During movement there are three parts of the glacier: The zone of basal sliding; the zone of plastic flow; and the rigid zone. The rigid zone is brittle and sometimes is broken into crevasses. Ice sheets move with these three zones but often spread laterally rather than flow downslope.
What zone is the top of the glacier?
All glaciers have accumulation and ablation zones. The boundary between between these two zones, the equilibrium line, is the transition where accumulation equals ablation (the same amount of snow accumulates as melts each year). The accumulation zone has three major layers. The top layer is snow.
What are the two zones of a glacier?
A glacier has two main sections: the accumulation zone and the ablation zone. High in the mountains, a glacier forms as snow accumulates and compresses first into “firn,” a granular ice, and then finally into glacial ice. A glacier begins to move, or “flow,” as it acquires more and more mass.
Where is the brittle zone of the glacier?
upper 150 feet The zone of brittle flow, the upper 150 feet of glacial ice, lacks this pressure and reacts in-elastically to the bedrock features, forming elongated cracks called crevasses which fluctuate with the glacier's flow.
What is the snowline quizlet?
What is the snowline? the elevation above which snow persists throughout the year.
What are the parts of a glacier?
Glaciers have two main sections: the accumulation area and the ablation area. The accumulation area is where temperatures are cold and snow collects, adding mass to the glacier. The ablation area is where temperatures are warmer, so some of the glacier melts.
What is the zone of ablation in a glacier?
Ablation zone—the part of the glacier where summer melting exceeds winter accumulation. This includes not only the total melting of the snow cover of the last winter but also a layer of glacier ice. A deficit of mass appears in that area. The zone lies at lower altitudes of the glacier surface.
What is a glacier headwall?
The headwall of a glacier is the rocky wall at the top end (head) of a glacier.
What are the different parts of a glacier?
Glaciers have two main sections: the accumulation area and the ablation area. The accumulation area is where temperatures are cold and snow collects, adding mass to the glacier. The ablation area is where temperatures are warmer, so some of the glacier melts.
What is the melt zone?
zone melting, any of a group of techniques used to purify an element or a compound or control its composition by melting a short region (i.e., zone) and causing this liquid zone to travel slowly through a relatively long ingot, or charge, of the solid.
What is the zone of wastage?
The area on a glacier where there is a net loss of snow and ice. Also known as zone of wastage.
What is the zone of wastage glacier?
Zone of accumulation and zone of wastage. The upper elevations of a glacier that are perennially covered in snow are called the zone of accumulation. The lower portion of the glacier where the ice is lost is called the zone of wastage. The snow line is the irregular boundary between these two zones.
What is the head of a glacier called?
Encyclopedic entry. A crevasse is a deep, wedge-shaped opening in a moving mass of ice called a glacier. Crevasses usually form in the top 50 meters (160 feet) of a glacier, where the ice is brittle.
What is the center of a glacier called?
Medial moraines run down the middle of a glacier, lateral moraines along the sides, and terminal moraines are found at the terminus, or snout, of a glacier.
What is a Arete glacier?
An arête is a thin, jagged crest that separates—or that once separated—two adjacent glaciers. These rugged ridgelines often look like serrated knives or saw blades, with steep sides and a sharp crest.
What is a headwall in geography?
Definition of headwall 1a : a precipice rising above the floor of a glacial cirque. b : a steep slope forming the head of a valley. 2 : a wall of masonry or concrete built at the outlet of a drainpipe or culvert with the end of the conduit flush with the outer surface of the wall.
What is molten region?
The molten region melts impure solid at its forward edge and leaves a wake of purer material solidified behind it as it moves through the ingot. The impurities concentrate in the melt, and are moved to one end of the ingot. Zone refining was invented by John Desmond Bernal and further developed by William G.
Where does the Cryoconite come from?
A deposit of dust and soot, often bound by microbial mats, that is formed on melting glaciers and ice sheets. The deposits are often found in pothole-like pockets on the ice surface.
What is an accumulation zone?
area of a glacier where more mass is gained than lost. glaciers.
What are the parts of a glacier called?
The lists include outlet glaciers, valley glaciers, cirque glaciers, tidewater glaciers and ice streams. Ice streams are a type of glacier and many of them have "glacier" in their name, e.g. Pine Island Glacier.
What is a glacial ridge called?
Drumlin. An elongated ridge of glacial sediment sculpted by ice moving over the bed of a glacier.
What is the headwall of a glacier?
The headwall of a glacier is the rocky wall at the top end (head) of a glacier.
What do headwalls do?
Headwalls allow water to flow through them and prevent the flowing water from damaging the area above whether that be an embankment, road shoulder or other area that requires retaining from erosion.
What is Melten?
Definition of molten 1 : fused or liquefied by heat : melted molten lava. 2 : having warmth or brilliance : glowing the molten sunlight of warm skies— T. B. Costain.
What is called zone refining?
Definition of zone refining : a technique for the purification of a crystalline material and especially a metal in which a molten region travels through the material to be refined, picks up impurities at its advancing edge, and then allows the purified part to recrystallize at its opposite edge.
What is a cryoconite hole?
Cryoconite holes are microbial oases within the extreme environment of a glacier's surface ice. These holes form when sediment is blown onto the ice and is heated by solar energy, causing it to melt into the glacier's surface.
What is a hole in a glacier called?
Cryoconite holes are vertical cylindrical melt holes in the glacier surface, which have a thin layer of sediment at the bottom and are filled with water. The Swedish explorer, A. E. Nordenskjöld, first named these melt holes during his 1870 Greenland expedition: “cryo” meaning ice and “conite” meaning dust .
What is accumulation in a glacier?
all processes by which snow or ice are added to a glacier, this is typically the accumulation of snow, which is slowly transformed into ice; other accumulation processes can include avalanches, wind-deposited snow, and the freezing of rain within the snow pack. glaciers.
What is a col in glacial?
two cirques is called a col. A higher mountain often has three or more cirques arranged in a radial pattern on its flanks. Headward erosion of these cirques finally leaves only a sharp peak flanked by nearly vertical headwall cliffs, which are separated by arêtes.