Is a glacial trough erosion or deposition?
Where ice from several cirques converged, forming a valley glacier, a trough was generally eroded. Further glacier growth in areas of high relief produced systems of tributary troughs hanging above major troughs, often with the development of rock basins.
What shape is a glacial trough quizlet?
A glacial trough is a steep sided valley with a flat bottom and steep sides. It starts off as a v- shaped valley but then turns into a u-shaped valley as the glacier erodes it.
Where do glaciers form?
Glaciers begin forming in places where more snow piles up each year than melts. Soon after falling, the snow begins to compress, or become denser and tightly packed. It slowly changes from light, fluffy crystals to hard, round ice pellets. New snow falls and buries this granular snow.
Why do glaciers form U-shaped valleys?
glacial valleys valley is converted to a U-shaped valley because the U-shape provides the least frictional resistance to the moving glacier. Because a glacier has a much greater viscosity and cross section than a river, its course has fewer and broader bends, and thus, the valley becomes straighter and smoother.
What causes a glacial trough to form?
The formation of a glacial trough involves two processes abrasion and plucking. Abrasion is when pieces of debris in the glacier wear away at the rocks below, a bit like sandpaper. The sharper rocks in the ice can also cause scratches in the rocks called striations.
How does glacial flooding occur?
A Glacial Lake Outburst Flood, or GLOF, is sudden release of water from a lake fed by glacier melt that has formed at the side, in front, within, beneath, or on the surface of a glacier.
What is glacial burst?
Glacier bursts are a cascading risk. Cascades of glacier bursts, cloudbursts, heavy rainfall and subsequent landslides are becoming more frequent and complex. The breaking of the Nanda Devi glacier triggered a landslide, avalanche, deluge, and flash floods in the intricately linked tributaries of the Ganga river.
Can glacier burst?
Seismic activity and a buildup of water pressure can cause glaciers to burst, but one particular concern is climate change. High temperatures coupled with less snowfall can accelerate melting, which causes water to rise to potentially dangerous levels.
How did flood occur in Uttarakhand?
This summer’s disaster, called the “Himalayan Tsunami” by some, was initially thought to be a glacial lake outburst flood. Later reports suggested the huge amount of water that surged downstream was caused by a breach in the boundary of a small lake that formed due to a huge landslide and heavy rainfall upstream.
How did flood occur in Uttarakhand 2021?
On 8 February 2021, The Times, London, reported that a flood was caused by a portion of glacier being torn away and causing a landslide. Kalachand Sain, director of the Wadia Institute, climate change is the major factor in the rapid freezing and thawing of ice that causes glacier fractures.
What had happened in Uttarakhand?
The sudden flood in the middle of the day in the Dhauli Ganga, Rishi Ganga and Alaknanda rivers — all intricately linked tributaries of the Ganga — triggered widespread panic and large-scale devastation in the high mountain areas. …
Why did flood occur in Kedarnath?
Most of the destruction at Kedarnath was caused by a sudden rapid melting of ice and snow on the Kedarnath Mountain, 6 km (3.7 mi) from the temple, which flooded the Chorabari Lake (upstream) and then Kedarnath. The temple was flooded with water resulting in several deaths due to drowning and panic-driven stampede.
Is Kedarnath true story?
Though the true story of Kedarnath isn’t based on any two individuals, the natural disaster that acts as a background for it is very real.
Which river flows in Kedarnath?
Mandakini river
Who saw Kedarnath temple first?
Pandavas