Grade 7 - Revision - Rivers, Coasts & Glaciation - Answer Key
Grade 7 - Revision - Rivers, Coasts & Glaciation - Answer Key
Grade 7 - Revision - Rivers, Coasts & Glaciation - Answer Key
1) Define Weathering?
2) Define Glaciers?
It forms when the climate becomes cold enough for precipitation to fall as snow. As the depth of snow piles up, its
weight turns the lower layers into ice. When the ice moves downhill under the force of gravity it is called a glacier.
3) Define Erosion?
Define graphs?
1) Truncated spurs are ridges that have been shortened or cut off by moving glacier
3) Corries are deep rounded hollows with a steep backwall and sides.
4) V-shaped valley is widened, deepened & straightened to leave a U – shape glacial trough
5) A gorge is a valley with almost vertical sides that has been carved out by the river and the waterfall.
Erosion wears away the land, transportation moves the material from one place to another and deposition builds up new
landforms.
The river has many bends these bends are known as meanders.
On either side of the river channel there is an area of flat land called the flood plain. This area get covered in water when
the river overflows its banks. Flood plains are made up of alluvium (silt), a fine muddy material that is left behind after
floods.
5) What is Erratics?
Erratics are boulders transported by ice and deposited often in an area of totally different rock.
6) Explain arêtes
Corries often develop on more than one side of a mountain. When this happens, the land between them gets narrower,
due to erosion until a knife-edged ridge is formed. This is called as arête.
Q. V. Differentiate between.
Water may get into a crack in a rock and When a rock is repeatedly heated and
freeze. cooled.
Found in mountainous areas where Found in desert areas where it is very hot
temperatures are often around freezing during the day and cool at night.
point
Refer page no. 6