How much plains area of India ?
Where is the volcanic mountain, Mount St. Helens located?
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What is a plain?
A Plain is an area of lowland, either level or
undulating. It seldom rises more than a few
hundred feet above the sea level. Plains usually
are best forms of land and are often intensively
cultivated. Population and settlements are
normally concentrated on plains and when they
are traversed by rivers, as most of them are,
their economic significance is even greater.
Examples: The Gangetic Plain, The Mississippi
Plain and The Yang-tze Plain. Some of the most
extensive temperate plains are grasslands like
Russia Steppes, The North American prairies and
Argentina’s Pampa.
Plains are majorly grouped
into three categories based on their modes of
formation:
Structural plains:
These are structurally depressed areas, which
make up some of the most extensive natural
lowlands on the earth’s surface. They are formed
from horizontally bedded rocks relatively
undisturbed by the crust movements of the
earth. These include The Great Plains of the
Russian Platform, The Great Plains of USA and
The Central Lowlands of Australia.
Depositional plains:
These are formed by the deposition of materials
brought by various agents of transportation such
as rivers, winds, waves and glaciers. Their
fertility and economic relevance depend greatly
upon the types of sediments laid down.
Depositional Plains are grouped into the
following:
Alluvial plains, formed by rivers:
Alluvial plain, formed over a long period of
time by a river depositing sediment on its
flood plain or bed which becomes the alluvial
soil. The difference between a flood plain and
an alluvial plain is that the flood plain
represents the area experiencing flooding
fairly regularly at present or recently,
whereas an alluvial plain includes areas
where the flood plain is now and used to be,
or areas which only experience flooding a few
times a century.
Flood plain, adjacent to a stream, river, lake
or wetland that experiences occasional or
periodic flooding.
Scroll plain is a plain through which a river
meanders with a very low gradient.
Lacustrine plain is a plain that originally
formed in a lacustrine environment, that is,
as the bed of a lake.
Lava plain is formed by sheets of flowing
lava.
Glacial plains, formed by the movement of
glaciers under the force of gravity:
Sandur (plural sandar) is a glacial out-wash
plain formed of sediments deposited by melt-
water at the terminus of a glacier. Sandar
consist mainly of stratified (layered and
sorted) gravel and sandTill plain, a plain of
glacial till that forms when a sheet of ice
becomes detached from the main body of a
glacier and melts in place depositing the
sediments it carries. Till plains are composed
of unsorted material (till) of all sizes.
Abyssal plain is a flat or very gently sloping
area of the deep ocean basin
Planitia, the Latin word for plain, is used in
the naming of plains on extraterrestrial
objects (planets and moons), such as Hellas
Planitia on Mars or SednaPlanitia on Venus.
Erosional Plains:
These plains are carved by the agents of
erosion. Rain, rivers, ice and wind help smoothen
out the irregularities of the earth’s surface, and
in terms of millions of years, even high
mountains can be reduced to low undulating
plains. Such plains of denudation are described
as pen plains, a word meaning almost-plains.
Rivers, in their course from source to sea, deepen
their valleys and widen their banks. The
projecting spurs are cut back so that the level
ground bordering the level bordering the river is
constantly widened. At the same time, the higher
land between the rivers is gradually lowered.
In glaciated regions, glaciers an ice sheets
sourced and levelled the land forming ice sourced
plains. Hollow scooped out by the ice are now
filled by lakes. These are extensive ice-sourced
plains in northern Europe and northern Canada.
Finland is estimated to have 35,000 lakes,
occupying 10 per cent of the total land surface of
the country.
Indo-Gangetic Plain:
The Indo-Ganga plains, also known as the
"Great Plains," are large floodplains of the Indus
and the Ganga–Brahmaputra river systems. They
run parallel to the Himalaya Mountains, from
Jammu and Kashmir in the west to Assam in the
east and draining most of northern and eastern
India. The plains encompass an area of 700,000
km and vary in width through their length by
several hundred kilometres. The major rivers of
this system are the Ganga and the Indus along
with their tributaries; Beas, Yamuna, Gomti, Ravi,
Chambal, Sutlej and Chenab.
Extent of the Indo-Gangetic plain across South
Asia.
A Plain is an area of lowland, either level or
undulating. It seldom rises more than a few
hundred feet above the sea level. Plains usually
are best forms of land and are often intensively
cultivated. Population and settlements are
normally concentrated on plains and when they
are traversed by rivers, as most of them are,
their economic significance is even greater.
Examples: The Gangetic Plain, The Mississippi
Plain and The Yang-tze Plain. Some of the most
extensive temperate plains are grasslands like
Russia Steppes, The North American prairies and
Argentina’s Pampa.
Plains are majorly grouped
into three categories based on their modes of
formation:
Structural plains:
These are structurally depressed areas, which
make up some of the most extensive natural
lowlands on the earth’s surface. They are formed
from horizontally bedded rocks relatively
undisturbed by the crust movements of the
earth. These include The Great Plains of the
Russian Platform, The Great Plains of USA and
The Central Lowlands of Australia.
Depositional plains:
These are formed by the deposition of materials
brought by various agents of transportation such
as rivers, winds, waves and glaciers. Their
fertility and economic relevance depend greatly
upon the types of sediments laid down.
Depositional Plains are grouped into the
following:
Alluvial plains, formed by rivers:
Alluvial plain, formed over a long period of
time by a river depositing sediment on its
flood plain or bed which becomes the alluvial
soil. The difference between a flood plain and
an alluvial plain is that the flood plain
represents the area experiencing flooding
fairly regularly at present or recently,
whereas an alluvial plain includes areas
where the flood plain is now and used to be,
or areas which only experience flooding a few
times a century.
Flood plain, adjacent to a stream, river, lake
or wetland that experiences occasional or
periodic flooding.
Scroll plain is a plain through which a river
meanders with a very low gradient.
Lacustrine plain is a plain that originally
formed in a lacustrine environment, that is,
as the bed of a lake.
Lava plain is formed by sheets of flowing
lava.
Glacial plains, formed by the movement of
glaciers under the force of gravity:
Sandur (plural sandar) is a glacial out-wash
plain formed of sediments deposited by melt-
water at the terminus of a glacier. Sandar
consist mainly of stratified (layered and
sorted) gravel and sandTill plain, a plain of
glacial till that forms when a sheet of ice
becomes detached from the main body of a
glacier and melts in place depositing the
sediments it carries. Till plains are composed
of unsorted material (till) of all sizes.
Abyssal plain is a flat or very gently sloping
area of the deep ocean basin
Planitia, the Latin word for plain, is used in
the naming of plains on extraterrestrial
objects (planets and moons), such as Hellas
Planitia on Mars or SednaPlanitia on Venus.
Erosional Plains:
These plains are carved by the agents of
erosion. Rain, rivers, ice and wind help smoothen
out the irregularities of the earth’s surface, and
in terms of millions of years, even high
mountains can be reduced to low undulating
plains. Such plains of denudation are described
as pen plains, a word meaning almost-plains.
Rivers, in their course from source to sea, deepen
their valleys and widen their banks. The
projecting spurs are cut back so that the level
ground bordering the level bordering the river is
constantly widened. At the same time, the higher
land between the rivers is gradually lowered.
In glaciated regions, glaciers an ice sheets
sourced and levelled the land forming ice sourced
plains. Hollow scooped out by the ice are now
filled by lakes. These are extensive ice-sourced
plains in northern Europe and northern Canada.
Finland is estimated to have 35,000 lakes,
occupying 10 per cent of the total land surface of
the country.
Indo-Gangetic Plain:
The Indo-Ganga plains, also known as the
"Great Plains," are large floodplains of the Indus
and the Ganga–Brahmaputra river systems. They
run parallel to the Himalaya Mountains, from
Jammu and Kashmir in the west to Assam in the
east and draining most of northern and eastern
India. The plains encompass an area of 700,000
km and vary in width through their length by
several hundred kilometres. The major rivers of
this system are the Ganga and the Indus along
with their tributaries; Beas, Yamuna, Gomti, Ravi,
Chambal, Sutlej and Chenab.
Extent of the Indo-Gangetic plain across South
Asia.
Girishmathur:
hi
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