Source: NCERT Official Textbook
The chapter provides a detailed, agent-wise breakdown. For running water in humid regions, it explains erosional features like valleys, gorges, potholes, and depositional forms such as alluvial fans, deltas, floodplains, and natural levees. It then covers groundwater processes, focusing on karst topography characterized by sinkholes, caves, stalactites, and stalagmites in limestone regions.
The work of glaciers is described, forming U-shaped valleys, cirques, horns, and depositing moraines, eskers, and drumlins. Coastal processes by waves create cliffs, stacks, spits, and bars along high rocky coasts, while building beaches and dunes on low sedimentary coasts.
Finally, in arid environments, wind acts as a dominant agent, eroding to form pediments, deflation hollows, and mushroom rocks, and depositing sorted materials as various types of sand dunes. The chapter emphasizes that the evolution of these landforms is a dynamic and continuous process.
What is considered the most important geomorphic agent in degrading land surfaces in humid regions? (Pg. 1)
What is the plain formed as a result of stream erosion called? (Pg. 2)
What are the large, deep holes at the base of waterfalls called? (Pg. 3)
What are the broad, cone-shaped deposits formed when streams break into foot slope plains called? (Pg. 3-4)
What are the low, linear ridges of coarse deposits along the banks of large rivers called? (Pg. 5)
A limestone region showing typical landforms produced by groundwater action is called ______ topography. (Pg. 6)
What are long, narrow to wide trenches formed when sinkholes join together called? (Pg. 7)
What are masses of ice moving as sheets over land or down mountain valleys called? (Pg. 8)
Glaciated valleys are typically: (Pg. 9)
What are sinuous ridges of sand and gravel deposited by streams flowing beneath a glacier called? (Pg. 10)
What are remnant masses of rock, originally parts of a cliff, standing isolated off the shore called? (Pg. 12)
Which of the following is NOT a primary erosional action of wind? (Pg. 13)
Shallow lakes in desert basins that retain water only for a short duration are called: (Pg. 14)
Crescent-shaped dunes with points directed downwind are called: (Pg. 14-15)
(Exercise) In which stage of landform development is downward cutting most dominant? (Pg. 15)
(Exercise) A deep valley characterised by steep step-like side slopes is known as: (Pg. 15)
(Exercise) In which region is chemical weathering more dominant than mechanical? (Pg. 15)
(Exercise) Which sentence best defines ‘Lapies’? (Pg. 15)
(Exercise) A deep trough with very steep concave walls at its head is known as: (Pg. 15)
The two components of running water are overland flow as a sheet and linear flow as ______. (Pg. 1) Page 47
A deep valley with very steep to straight sides is called a ______. (Pg. 2) Page 48
Meanders cut into hard rocks are called ______ or entrenched meanders. (Pg. 3) Page 49
Unlike alluvial fans, the deposits making up ______ are very well sorted with clear stratification. (Pg. 4) Page 50
Deposits found on the concave side of meanders are called ______ or meander bars. (Pg. 5) Page 51
Small to medium round depressions on limestone surfaces formed by solution are called ______ holes. (Pg. 6) Page 52
The irregular limestone surface with sharp pinnacles and ridges is called ______. (Pg. 7) Page 53
The most common landform in glaciated mountains, a deep trough at the head of a glacier, is a ______. (Pg. 8) Page 54
Very deep glacial troughs filled with seawater are called ______. (Pg. 9) Page 55
Smooth, oval-shaped ridges composed of glacial till are called ______. (Pg. 10-11) Page 56-57
A ridge of sand and shingle lying parallel to the coast in the offshore zone is called an ______ bar. (Pg. 12) Page 58
Gently inclined rocky floors close to mountains in deserts are called ______. (Pg. 13) Page 59
Wind-carved rock remnants with a slender stalk and broad cap are called ______ rocks. (Pg. 14) Page 60
Long ridges of sand aligned parallel to the wind direction in areas of poor sand supply are ______ dunes. (Pg. 15) Page 61
(Exercise) What do incised meanders in rocks indicate? (Pg. 15) Page 61
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