What is the origin of curved ridges in the Great Lakes area quizlet?
What do these curved ridges (eskers) suggest happened on the landscape? Meltwater channels were below or within a glacier. humans mine them as a source of gravel.
What is this bowl shaped glacially carved feature?
cirque. a bowl-shaped hollow eroded by a glacier.
What happens to the land surface when large ice sheets melt away quizlet?
What happens to the land surface when large ice sheets melt away? The land flexes upward due to isostatic rebound.
What geologic setting is responsible for the formation of the rocks exposed in the Sierra Nevada and adjacent features?
Terms in this set (12) Curry Village lies outside the flood hazard zone, but inside the rockfall hazard zone. Melting due to water driven off of the Farallon plate produced magma that buoyantly rose upward during this event, forming the ancestral Sierra Nevada.
How is a Roche Moutonnee formed?
A Roche moutonnée is a mass of resistant rock which has a smooth, rounded up valley (STOSS) slope facing direction of ice flow and a down (LEE) slope formed by Plucking. As the glacier encounters the obstacle pressure increases and allows melting to occur.
How are glacial striations formed?
Over time, the glacier moves over rock and sediment, leaving striations or striae, on the rock surfaces that can reveal the direction that the glacier was flowing.
Why do cirques face north?
Controls on cirque aspect Firstly, north-facing cirques receive less solar radiation than south-facing cirques (in the Northern Hemisphere), resulting in lower air temperatures and less ice-melt across the year15.
What does a cirque look like?
Cirques are bowl-shaped, amphitheater-like depressions that glaciers carve into mountains and valley sidewalls at high elevations. Often, the glaciers flow up and over the lip of the cirque as gravity drives them downslope. Lakes (called tarns) often occupy these depressions once the glaciers retreat.
What would occur if all of the ice on Greenland and Antarctica melted?
If all the ice covering Antarctica , Greenland, and in mountain glaciers around the world were to melt, sea level would rise about 70 meters (230 feet). The ocean would cover all the coastal cities. And land area would shrink significantly. But many cities, such as Denver, would survive.
What happens to snowflakes as they become progressively buried?
What happens to snowflakes as they become progressively buried within glaciers? They become interlocking crystals of ice.
What geologic process feature was most dominant in creating the rounded Domal shape of the intact part of Half Dome in Yosemite National Park Group of answer choices?
As the overlying rock eroded, the confining pressure on the pluton was removed and a type of weathering called exfoliation slowly created the more rounded appearance of the dome.
Are the Sierra Nevada mountains still growing?
The Sierra Nevada mountain range is growing at a rapid pace, says new research. The team of researchers from the University of Nevada's geodetic laboratory in Reno and the University of Glasgow in the UK, found the mountains growing at about half an inch every 10 years.
How big is a roche moutonnée?
Roches moutonnees vary in size from less than 1 m across (Rastas & Seppala, 1980) to several hundred metres or even kilometres in size (Jahns, 1943; Sugden et al., 1992).
What does roche moutonnée mean?
Definition of roche moutonnée : an elongate rounded ice-sculptured hillock of bedrock.
What are glacial ridges called?
Drumlin. An elongated ridge of glacial sediment sculpted by ice moving over the bed of a glacier.
What do glacial striations indicate?
Glacier scientists often use striations to determine the direction that the glacier was flowing, and in places where the glacier flowed in different directions over time, they can tease out this complex flow history by looking at the layered striations.
How was cirque formed?
How is a cirque formed? Corries or cirques are mountain valley heads that have been shaped into deep hollows by the erosion of small glaciers. They are frequently found on the heads of a glacial valley. Accumulated ice sheets when they move down a mountain, cut the land to form these cirques.
What is the difference between arêtes and cirques?
An arête is a thin, crest of rock left after two adjacent glaciers have worn a steep ridge into the rock. A horn results when glaciers erode three or more arêtes, usually forming a sharp-edged peak. Cirques are concave, circular basins carved by the base of a glacier as it erodes the landscape.
Why do corries face north?
In the Northern hemisphere this tends to be on North west to south East facing slopes which because of their aspect are slightly protected from the sun, which allows snow to lie on the ground for longer and accumulate.
What cities will be underwater in 2050?
There are numerous heavily populated sinking cities like Mumbai, Shanghai, NYC, and Miami at risk. With a population of 10 million, Jakarta is considered by some to be “the fastest-sinking city in the world” and is projected to be “entirely underwater by 2050”.
How many years will it take for Antarctica to melt?
If the ice sheet were to melt completely–a process that could take as little as 500 years according to some models–global sea levels could rise by as much as 20 feet, inundating islands and coastal areas worldwide. The debate over whether the ice sheet is at risk hinges partly on its past history.
When a river enters a lake or an ocean It slows down losing its capacity to carry sediments forming?
Deposition in a delta occurs where a stream slows, losing capacity and depositing its load of sediment. The morphology of a delta and the type of sediment deposited reflect the sediment load and discharge of the stream. You just studied 27 terms!
What is the primary reason that an increase in glaciers on land would cause sea level to fall?
What is a primary reason an increase in glaciers on land would cause sea level to fall? the erosive effects of waves.
How did Half Dome get its shape?
The solidified magma chamber – called a pluton – was then exposed by uplift and erosion of the overlying rock. As the overlying rock eroded, the confining pressure on the pluton was removed and a type of weathering called exfoliation slowly created the more rounded appearance of the dome.
How did Half Dome split?
Millions of years ago, Half Dome was larger than it is today, but it never sported a matching half in front of the sheer cliff face. Deep inside the great hunk of rock, a broad vertical crack was exposed when glaciers flowed by and undercut Half Dome's base.
Are the Sierras higher than the Rockies?
While many of the mountains in the Sierra Nevada range and the Rocky Mountains are approximately the same height, the Sierra Nevada range is slightly… See full answer below.
What does Sierra Nevada mean in English?
Padre Pedro Font gave the name Sierra Nevada to the mountain range on the eastern fringe of Spanish California in 1776. Sierra means mountains, that's mountains plural in Spanish, and Nevada means snow-covered.
Why are corries north facing?
In the Northern hemisphere this tends to be on North west to south East facing slopes which because of their aspect are slightly protected from the sun, which allows snow to lie on the ground for longer and accumulate.
What are sheep rocks?
In glaciology, a roche moutonnée (or sheepback) is a rock formation created by the passing of a glacier. The passage of glacial ice over underlying bedrock often results in asymmetric erosional forms as a result of abrasion on the "stoss" (upstream) side of the rock and plucking on the "lee" (downstream) side.
How is a Drumlin different from a roche moutonnée?
0:423:57Drumlins, Roche Moutonnee, & Crag And Tail – YouTubeYouTube