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 the meaning of ablation zone?
Ablation zone or ablation area refers to the low-altitude area of a glacier or ice sheet below firn with a net loss in ice mass due to melting, sublimation, evaporation, ice calving, aeolian processes like blowing snow, avalanche, and any other ablation.
What is the boundary between the zone of ablation and zone of accumulation called?
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).
Where ablation is equal to accumulation?
Equilibrium line altitude Equilibrium line altitude The zone where there is net accumulation (where there is more mass gained than lost) is the accumulation zone. The part of the glacier that has more ablation than accumulation is the ablation zone. Where ablation is equal to accumulation is the Equilibrium line altitude.
What is an accumulation zone?
area of a glacier where more mass is gained than lost. glaciers.
What is accumulation and ablation?
A glacier is a pile of snow and ice. In cold regions (either towards the poles or at high altitudes), more snow falls (accumulates) than melts (ablates) in the summer season.
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 accumulation phase?
Accumulation phase refers to the period in a person's life in which they are saving for retirement. The accumulation happens ahead of the distribution phase when they are retired and spending the money.
What is accumulation zone?
area of a glacier where more mass is gained than lost. glaciers.
What is 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 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.
What is zone refining method?
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 the accumulation stage of an annuity?
For an annuity, the accumulation period is the segment of time in which contributions to the investment are made regularly. The length of the accumulation period may be specified at the time the account is created, or it may depend on when you elect to withdraw funds based on your retirement timeline.
What is the accumulation phase of an annuity?
The accumulation period of an annuity is the phase where you are increasing the cash value of your annuity. After this period is over, your annuity will be either annuitized or cashed out.
What is Zone Phase refining?
Answer. (i) Zone refining: This method is based on the principle that impurities are more soluble in the molten state of metal (the melt) than in the solid state. In the process of zone refining, a circular mobile heater is fixed at one end of a rod of impure metal.
Is zone refining method the molten zone?
Zone-refining process is a group of similar methods of purifying crystals, in which a narrow region of a crystal is melted, and this molten zone is moved along the crystal. 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.
What is zone melting method?
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. As the zone travels, it redistributes impurities along the charge.
What is zone refining example?
The impure metal converted into a rod which is heated at one end with a circular heater. This method is used for refining metals having a low melting point. e.g., tin, lead, bismuth.
What is another name for accumulation of an annuity?
Accumulation periods are specific to deferred annuities, and they end when the premiums are converted to an income stream. This conversion is referred to annuitization. Immediate annuities, also known as income annuities, don't have an accumulation phase because they are annuitized at the time of purchase.
What is accumulation stage in investment?
The accumulation phase refers to the time in the life cycle of an investment when an individual or an investor builds up the value of their annuity or investment. It is the second phase in the process of investing.
What is zone refining with example?
The impure metal converted into a rod which is heated at one end with a circular heater. This method is used for refining metals having a low melting point. e.g., tin, lead, bismuth.
Which of the following is purified by zone refining?
Zone refining process is used in the purification of germanium.
What is float zone growth?
The floating zone (FZ) technique is a crucible-free crystal growth method. In FZ growth, the molten zone is kept between two vertical solid rods by its own surface tension (Figure 17). A single crystal is grown by dipping a seed crystal into one end of the zone and translating the molten zone toward the feed stock.
What is Zone phase refining?
Answer. (i) Zone refining: This method is based on the principle that impurities are more soluble in the molten state of metal (the melt) than in the solid state. In the process of zone refining, a circular mobile heater is fixed at one end of a rod of impure metal.
What is zone melting process?
Zone melting is a means of using the freezing process to manipulate impurities. It combines the fact that a freezing crystal differs in composition from the liquid from which it crystallizes with the idea of passing a short liquid zone along a lengthy solid.
What is the accumulation period of an annuity called?
accumulation phase Annuities have two phases: the accumulation phase (also called the accumulation period) and the payout phase. In the accumulation period, your premiums earn interest and grow. The accumulation period ends when you choose to annuitize or withdraw your funds.
What is zone refining process?
: 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.
Where is zone refining used?
-Zone refining process is used for the purification of metal. -Metals are purified through this process to a very high degree. The other name of zone refining is called fractional crystallization. -Ultra-pure samples of metals like germanium, silicon, boron, and gallium are obtained through this process.
How does Zone refining work?
Zone refining is the most important of the zone-melting techniques. In zone refining, a solid is refined by passing a number of molten zones through it in one direction. Each zone carries a fraction of the impurities to the end of the solid charge, thereby purifying the remainder.
How does Czochralski method differ from float zone technique?
The main advantage of the float-zone technique is the very low impurity concentration in the silicon crystal. In particular the oxygen and carbon concentration are much lower as compared to CZ silicon, since the melt does not come into contact with a quartz crucible, and no hot graphite container is used.