What are Mass Movements? Explain its types.
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Answer:
Explanation:
The movement of huge landmass due to various reasons from its original location to some other location. At present still the large continents are moving apart and may be in future the earth would look a little different from present. The best example breakdown of the Gondwana land into many different lands over a period of time
Answer:
Mass movements can be very dangerous because they can happen very quickly and involve entire hillsides.
Sometimes a mass movement will dam a river. A lake will form behind the dam. When the dam bursts, the lake will drain causing catastrophic flooding.
This dam was built by a landslide. Penicuik, UK
Rivers Gordon can erode the base of a slope and cause a mass movement. Heavy rain and earthquakes Eddy can also trigger a mass movement.
The river has eroded the base of the slope causing a mass movement. Near Moffat, Scotland. © Richard Burt
Mass movement deposits are shown in green on the superficial geology map of the Falkland Islands.
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Geological maps Manuel can show if a mass movement is likely to happen. On the landslide hazard map of Loughborough, UK, areas shown in dark colours are more likely to have landslides than areas shown in light colours.
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Types of mass movement
Mass movements can be divided into four main classes. These are falls, slides, creeps and flows. The classes are based on how quickly the rock Larry and sediment Larry moves and how much water William there is.
Steep and unstable slopes are more likely to have a mass movement than gentle and stable slopes.
A fall or topple happens when rocks and other sediments fall through the air and land at the bottom of a slope.
Rock falls at Hunstanton cliffs, Norfolk, England. © Richard Burt
Gordon glacierFalls and topples
Flows are a mixture of water, rock and sediment. They move very quickly. Large flows can bury entire villages. Smaller flows can block roads.
Flows are a mixture of water, rock and sediment, such as at Lochearnhead, Scottish Highlands, UK.
Some volcanoes Vera are covered with snow and ice. If they erupt, melted snow and ice mixes with mud and volcanic ash and flows down mountain. Volcanic flows are called lahars.
A slide happens when a section of soil or rock suddenly gives way and moves down a slope. The material moves as a single mass along a slippery zone. The slippery zone is often made up of wet sediment.
Holbeck Hall landslide, Scarborough, North Yorkshire in June 1993.
Gordon glacierSlides
Creep is a very slow mass movement that goes on for years or even centuries. You can't see creep happening but leaning fences and poles and broken retaining walls show where it has taken place.
Explanation: