what term describes open fissures in the brittle, surface ice of a glacier?

What Term Describes Open Fissures In The Brittle, Surface Ice Of A Glacier??

“T/F:Sand and gravel deposited by glacial meltwater streams are known as outwash till or stratified till.” … What term describes open fissures in the brittle, surface ice of a glacier? AE. crevasse. What general term denotes wastage of a glacier?

What are the two major flow mechanisms in a glacier?

There are two primary mechanisms at work within a glacier that cause it to move: plastic flow and basal slip.

What are erosional features produced by Valley Alpine glaciers?

Erosional feature produced by alpine valley glaciers is called Cirque. These are formed at the head of glacier and are formed by glacier pushing back into the mountain top. A cirque is characterized by bowl shaped depression at the head of the glacial valley.

Which type of glacial drift is deposited by glacial meltwater?

Stratified Drift
Blank. Glacial Drift: material deposited by a glacier. Two types of drift are Till (unsorted, unstratified debris deposited directly from ice) and Stratified Drift (sorted and stratified debris deposited from glacial meltwater).

Which of the following describes a Drumlin?

Drumlins are oval-shaped hills, largely composed of glacial drift, formed beneath a glacier or ice sheet and aligned in the direction of ice flow.

What is basal flow?

flow can occur in both polar and temperate glaciers. 2. Basal sliding: this involves the sliding of a glacier over its rocky base. The sliding is accomplished in three ways. basal slip: when a thin layer of water builds up at the ice-rock interface and the reduction in friction enables the ice to slide forward.

What is the best explanation for glacial surge?

Which of the following is the best explanation for a glacial surge? Melting at the base of the glacier results in increased rates of basal slip. Which feature represents a former meltwater channel or tunnel in glacial ice that was filled with sand and gravel?

Which of the following are erosional features?

Caves, arches, stacks and stumps are erosional features that are commonly found on a headland.

Which of the following defines erosion?

Erosion is the geological process in which earthen materials are worn away and transported by natural forces such as wind or water. A similar process, weathering, breaks down or dissolves rock, but does not involve movement. … If the wind is dusty, or water or glacial ice is muddy, erosion is taking place.

Which of the following are erosional features carved from bedrock by glaciers?

Arête, horns and U-shaped valleys are erosional features carved from bedrock by glaciers.

Which type of glacial drift is deposited by glacial meltwater quizlet?

Glacial drift is divided into two distinct types: (1) materials deposited directly by the glacier, which are known as till, and (2) sediments laid down by glacial meltwater, called stratified drift. An unsorted and unstratified accumulation of glacial sediment, deposited directly by glacier ice.

What is stratified drift?

STRATIFIED DRIFT means predominantly unconsolidated, sorted sediment composed of layers of sand, gravel, silt or clay deposited by meltwaters from glaciers.

What is glacial marine drift?

Glacial marine drift – rock debris that is deposited on the seafloor or lake bed as an unsorted chaotic deposit when glaciers reach oceans or lakes as large icebergs and melt over time.

Which of the following describes a glacier?

A glacier is a huge mass of ice that moves slowly over land. The term “glacier” comes from the French word glace (glah-SAY), which means ice. Glaciers are often called “rivers of ice.” Glaciers fall into two groups: alpine glaciers and ice sheets.

What best describes a glacier?

Glaciers are made up of fallen snow that, over many years, compresses into large, thickened ice masses. Glaciers form when snow remains in one location long enough to transform into ice. What makes glaciers unique is their ability to flow. Due to sheer mass, glaciers flow like very slow rivers.

What is a drumlin in glaciers?

Drumlins are hills of sediment (generally a quarter of a mile or more in length) that have been streamlined by glacier flow. … The classic drumlin shapes is a hill that highest on its up-glacier end and tapers gently from there, like a half-buried egg.

What is extensional flow glacier?

Extensional flow: where the gradient becomes steeper the ice moves faster ‘stretching’ the ice mass and becoming thinner through a series of fractures which form crevasses at right angles to the direction of flow.

What is glacier flow?

In simple terms, for a glacier to maintain a state of equilibrium, glacier flow is required to balance inputs and outputs to the system. Glacier motion facilitates the transfer of ice from the accumulation zone (where mass gain is dominant) to the ablation zone (where mass loss is dominant).

What is rotational slip?

The semicircular motion of a mass of rock and/or soil as it moves downslope along a concave face. Evidence for rotational slip in cirques comes from the dirt bands observed in cirque ice, which become progressively steeper from the back wall, but then flatten towards the cirque mouth.

Which of the following responses best defines the movement of ice with a glacier?

Which of the following responses best defines the movement of ice within a glacier? Glacial movement is always in a downslope direction. The terminus of a glacier will advance when which of the following conditions is met? Accumulation of snow is greater than wastage.

What happens when a glacier surges?

When a glacier surges, it flows more quickly, sometimes moving 10 to 100 times faster than it normally does. Some glaciers surge in cycles throughout a year, or surge only periodically, perhaps between 15 and 100 years. Some glaciers in Alaska have surged across roads and rivers, blocking access and damming water.

What characterizes a surge-type glacier?

Surge-type glaciers are characterised by flow instabilities, with periods of fast flow followed by long quiescent periods. They are slow moving during their quiescent phases, when they thin and melt in their lower reaches, but accumulate snow and ice in their upper parts.

What are glaciers describe an erosional and depositional feature caused by glaciers?

Glaciers cause erosion by plucking and abrasion. Valley glaciers form several unique features through erosion, including cirques, arêtes, and horns. Glaciers deposit their sediment when they melt. Landforms deposited by glaciers include drumlins, kettle lakes, and eskers.

What is erosion in Glacier?

Glacial erosion includes processes that occur directly in association with the movement of glacial ice over its bed, such as abrasion, quarrying, and physical and chemical erosion by subglacial meltwater, as well as from the fluvial and mass wasting processes that are enhanced or modified by glaciation.

Which of the following is an erosional feature of glaciers?

As the glaciers expand, due to their accumulating weight of snow and ice they crush and abrade and scour surfaces such as rocks and bedrock. The resulting erosional landforms include striations, cirques, glacial horns, arêtes, trim lines, U-shaped valleys, roches moutonnées, overdeepenings and hanging valleys.

What is meant by term weathering?

Weathering is the breaking down or dissolving of rocks and minerals on Earths surface. Once a rock has been broken down, a process called erosion transports the bits of rock and minerals away. … Weathering describes the breaking down or dissolving of rocks and minerals on the surface of the Earth.

Which of the following best describes the word erosion?

Which of the following statements best describes erosion? Erosion is the process by which weathered rock and mineral particles are removed from one area and transported elsewhere.

Is erosional a word?

1. the act or process of eroding. 2. the state of being eroded.

What are windblown sediments called?

windblown deposits of fine-grained sediments. loess. a deposit from a glaciers meltwater. outwash. deposits formed when windblown sediments pile up behind an obstacle.

What do you mean by moraine?

A moraine is material left behind by a moving glacier. This material is usually soil and rock. Just as rivers carry along all sorts of debris and silt that eventually builds up to form deltas, glaciers transport all sorts of dirt and boulders that build up to form moraines.

What is the loosening and lifting of blocks of rock by glaciers?

The loosening and lifting of blocks of rock by glaciers is called. plucking.

What is a glacial drift quizlet?

Glacial drift. The general term for all sediments deposited by a glacier. Till. Unsorted glacial drift that is deposited directly from a melting glacier.

Are both deposited by meltwater streams?

Eskers and kames are deposited by meltwater streams; they are composed of stratified sand and gravel. Sand and gravel deposited by glacial meltwater streams are known as outwash till or stratified till.

What name is given to a body of water that formed from the melting of blocks of ice trapped in glacial sediment?

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