Question

plz answer this three questions. If you can answer i will mark you in brainlist.

Answer 1

Alluvial soil mostly found in gangetic plains.It is formed by deposits and sediments of river.These soil consist of varying amount of salt, silt and clay.

Answer 2

1) Mountains have an extremely important role in influencing global and regional climates and weather conditions. They cover around one-quarter of the earth's land surface and are home to 720 million people around the world. Indirectly, billions more living downstream also benefit from mountains.

Mountains provide us with freshwater, energy, food, biodiversity, and medicinal products – resources that may become very rare in the coming decades. They are also very prone to climate changes, land degradation, deforestation and natural disasters. In addition, mountain people very often face marginalization, poverty, and the lack of basic services such as health and education.

The challenge is to identify new and sustainable opportunities that can bring benefits to both highland and lowland communities and help to eradicate poverty without contributing to the degradation of fragile mountain ecosystems.

This year, the International Mountain Day is observed under the theme Mountain Farming. The aim is to stress the importance of sustainable mountain development at the global level.


2)Plateaus are very useful becasue it is a storehouse of minerals that are used as raw materials for many industries.

It provides us with food materials and raw materials for our industries.

The lava plateaus are rich in black soil good for cultivation. many plateaus are great attraction to tourists.

3)An alluvial plain is a largely flat landformcreated by the deposition of sediment over a long period of time by one or more riverscoming from highland regions, from which alluvial soil forms. A floodplain is part of the process, being the smaller area over which the rivers flood at a particular period of time, whereas the alluvial plain is the larger area representing the region over which the floodplains have shifted over geological time.

As the highlands erode due to weathering and water flow, the sediment from the hills is transported to the lower plain. Various creekswill carry the water further to a river, lake, bay, or ocean. As the sediments are deposited during flood conditions in the floodplain of a creek, the elevation of the floodplain will be raised. As this reduces the channel floodwater capacity, the creek will, over time, seek new, lower paths, forming a meander (a curving sinuous path). The leftover higher locations, typically natural levees at the margins of the flood channel, will themselves be eroded by lateral stream erosion and from local rainfall and possibly wind transport if the climate is arid and does not support soil-holding grasses. These processes, over geologic time, will form the plain, a region with little relief(local changes in elevation), yet with a constant but small slope.

The Glossary of Landform and Geologic Terms, maintained by the United States' National Cooperative Soil Survey, defines an "alluvial plain" as "a large assemblage of fluvial landforms (braided streams, terraces, etc.,) that form low gradient, regional ramps along the flanks of mountains and extend great distances from their sources (e.g., High Plains of North America)" Use of "alluvial plain" as a general, informal term for a broad flood plain or a low-gradient delta is explicitly discouraged. The NCSS glossary instead suggests "flood plain".


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