Source: NCERT Official Textbook
Endogenic processes, driven by Earth’s internal energy, include diastrophism (mountain and continent building) and volcanism. Exogenic processes, powered primarily by solar energy, encompass weathering, mass wasting, erosion, and deposition, collectively known as denudation.
The chapter provides a detailed examination of weathering, the in-situ breakdown of rocks through chemical, physical, and biological means, highlighting its crucial role in preparing material for erosion and soil formation. It then explores mass movements, the downslope movement of debris under gravity, explaining various types like slump, landslides, and rock falls, and their triggers. Finally, the chapter outlines the fundamentals of soil formation (pedogenesis), identifying five key control factors: parent material, topography, climate, biological activity, and time.
It explains how climate and biological activity act as active agents, influencing the rate of chemical reactions and humus content, ultimately determining the character and maturity of the soil profile. The entire discussion underscores the dynamic and interconnected nature of the systems that sculpt our physical environment.
Which of the following are classified as endogenic geomorphic processes? (Pg. 3)
What is the prime source of energy behind endogenic geomorphic processes? (Pg. 3)
Which of the following is a general term that covers all exogenic processes? (Pg. 4)
What is the sole driving force behind all exogenic processes? (Pg. 4)
Which type of weathering involves processes like solution, carbonation, and oxidation? (Pg. 5)
How does weathering contribute to the national economy? (Pg. 6)
What is the term for a rapid mass movement where rock debris slips with a backward rotation? (Pg. 7)
Which of the following is NOT considered a climatically controlled agent of erosion? (Pg. 8)
Which of the following is considered a passive control factor in soil formation? (Pg. 9)
In which climatic region would you expect soils with very low humus content due to rapid bacterial action? (Pg. 10)
(Exercise) Which one of the following processes is a gradational process? (Pg. 11)
(Exercise) Which one of the following materials is affected by hydration process? (Pg. 11)
(Exercise) Debris avalanche can be included in the category of: (Pg. 11)
The actions of exogenic forces result in the wearing down of relief, which is known as ______. (Pg. 2) Page 37
All processes that move, elevate or build up portions of the earth’s crust are collectively called ______. (Pg. 3) Page 38
The force applied per unit area on earth materials is called ______. (Pg. 4) Page 39
Weathering is an ______ process, meaning very little or no motion of materials takes place. (Pg. 5) Page 40
______ weathering involves contributions from or removal by organisms like earthworms and plant roots. (Pg. 6) Page 41
The transfer of rock debris down slopes under the direct influence of gravity is called ______. (Pg. 6) Page 41
The nearly free fall of earth debris from a vertical face is called ______. (Pg. 7) Page 42
______ is a consequence of erosion, occurring when erosional agents lose their velocity. (Pg. 8) Page 43
The science of soil is called ______. (Pg. 9) Page 44
The process by which bacteria convert gaseous nitrogen from the air into a usable chemical form for plants is called ______. (Pg. 10) Page 45
(Exercise) List examples of mass movements that are real rapid and perceptible. (Pg. 11) Page 46
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