What causes a glacier to advance?
Glaciers advance and retreat. If more snow and ice are added than are lost through melting, calving, or evaporation, glaciers will advance. If less snow and ice are added than are lost, glaciers will retreat. In this zone, the glacier gains snow and ice.
What is probably the least expensive approach for avoiding shoreline hazards?
What is probably the least expensive approach for avoiding shoreline hazards? Forbid the building of houses or other structures in high risk areas.
What does a terminal moraine represent?
BSL Geography Glossary – Terminal Moraine – definition Definition: Moraines are areas where sediment created by glacial erosion is deposited. The terminal moraine represents the maximum expansion of the glacier..
What happens to snowflakes as they become progressively buried within glaciers?
A. they become less dense because of large amounts of trapped airB. they begin to melt as they are insulated from the cold airC. they become interlocking crystals of iceD.
What happens to snowflakes as they become progressively buried within glaciers quizlet?
What happens to snowflakes as they become progressively buried within glaciers? They become interlocking crystals of ice. Large blocks of ice collapse off the front of the glacier and become icebergs.
Which of the following is a way that plate tectonics can affect climate?
plate tectonics affects climate by opening up ocean basins and changing ocean currents as a result. as tectonic plates move away from or towards each other, they may end up closing up or opening oceans and as a result change the direction and orientation of ocean currents that cause climate change.
What feature will be formed by the sediment carried along the sides of this glacier?
Lateral moraines are parallel ridges of debris deposited along the sides of a glacier. The unconsolidated debris can be deposited on top of the glacier by frost shattering of the valley walls and/or from tributary streams flowing into the valley. The till is carried along the glacial margin until the glacier melts.
What is the load of a glacier?
Load. An advancing ice sheet carries an abundance of rock that was plucked from the underlying bedrock; only a small amount is carried on the surface from mass wasting. The various unsorted rock debris and sediment that is carried or later deposited by a glacier is called till.
What are the two basic types of glacial deposits?
There are two primary types of glaciers: Continental: Ice sheets are dome-shaped glaciers that flow away from a central region and are largely unaffected by underlying topography (e.g., Greenland and Antarctic ice sheets); Alpine or valley: glaciers in mountains that flow down valleys.
Are river deposits sorted?
Glacial deposits are sorted, and river deposits are unsorted.
What is it called when a glacier deposits rocks in oceans and lakes?
The process in which a glacier deposits rocks in oceans and lakes is called deposition. Water, ice, wind, and gravity transport weathered surface material, that, at losing of enough kinetic energy in the fluid, is deposited, thus, building up sediment layers.
Are eskers sorted or unsorted?
Two types of drift are Till (unsorted, unstratified debris deposited directly from ice) and Stratified Drift (sorted and stratified debris deposited from glacial meltwater). The front edge of the glacier remains stationary while the conveyor belt of ice brings down more material.
Is Drumlin till or stratified drift?
In some areas, elongated hills known as drumlins form conspicuous features of ground moraine topography. These hills are composed of ordinary un-stratified drift. See Fig. 8.5.
What is the difference between a snowfield and a glacier?
A large amount of snow that stays around all year is called a snowfield. If they grow large enough, the snow will pack together into ice and begin to flow like a glacier. A glacier is a large amount of ice that sits on the land.
How can a glacier deposit both sorted and unsorted material?
Meltwater streams flowing through a glacier carry sorted material. Unsorted material is deposited when a glacier melts entirely.
What is the difference between sorted and unsorted glacial deposits?
Glaciers are powerful enough to carry tiny and huge rock debris, and when they drop it, the ice drops it indiscriminantly. Thus, material deposited by ice is unsorted or mixed in size. This non-sorted material is called TILL. If the water and the ice work together, the material is sorted, so it is drift but not till.
What are the three types of glacial deposition?
Landforms of Glacial Deposition
- Moraines.
- Drumlins (boulder clay or till)
- Erratics.
What are some of the depositional features of glaciers What kind of materials do they deposit?
U-shaped valleys, hanging valleys, cirques, horns, and aretes are features sculpted by ice. The eroded material is later deposited as large glacial erratics, in moraines, stratified drift, outwash plains, and drumlins.
What are the three depositional features?
The major deposition landforms are beaches, spits and bars.
Which of the following things might be left behind by a glacier?
Glacial erratics are stones and rocks that were transported by a glacier, and then left behind after the glacier melted. Erratics can be carried for hundreds of kilometers, and can range in size from pebbles to large boulders. Scientists sometimes use erratics to help determine ancient glacier movement.
What does erratic look like?
Erratics may be embedded in till or occur on the ground surface and may range in size from pebbles to huge boulders weighing thousands of tons. Erratics composed of unusual and distinctive rock types can be traced to their source of origin and serve as indicators of the direction of glacial movement.
What is the difference between a glacier and a river?
River is the water bodies which is recharged by glaciers melt water, snow melt and water springs. A river is a body of water flowing through a definite channel from a source at a higher level to a mouth located at a lower elevation. A glacier on the other hand is a body of solid ice moving out of a snowfield.