Maharashtra Board Class 9 Geography Solution Chapter 3 – Exogenetic Processes Part- I
Balbharati Maharashtra Board Class 9 Geography Solution Chapter 3: Exogenetic Processes Part- I. Marathi or English Medium Students of Class 9 get here Exogenetic Processes Part- I full Exercise Solution.
|Maharashtra Class 9|
Geography (Bhugol) Solution
Exogenetic Processes Part- I
Q 1. Answer in brief.
(a) What is mechanical weathering ?
Ans) Mechanical weathering is the process of breaking of rocks. Different Environmental factors are the reason behind of mechanical weathering. When the exposed part of the rock gets more heat than the inner part and the inner part becomes comparatively cooler, the outer layers of the rocks fall apart from the main rock. This is called mechanical weathering. Temperature , Frost, Crystal growth , Release of pressure Water are the reason of mechanical weathering.
(b) What are the main types of chemical weathering?
Ans) When the weathering of the rocks occur due to the chemical changes and break down happens, it is called chemical weathering. The main types of chemical weathering are- Carbonation, Solution and Oxidation.
(c) How does biological weathering occur?
Ans) When the weathering occurs due to the biological factors of the rocks are called biological weathering. Tension created by the growing roots in between the cracks of the old rocks, activities of ants, rats, mice, rabbits and other worms and insects are responsible for biological weathering.
(d) Distinguish between weathering and mass wasting.
Differences between weathering and mass wasting are-
- Breaking or weakening of rocks due to natural process is called weathering. Three types of weathering is there- Mechanical, Chemical and Biological.
- Weathered particles move down due to gravity alone , accumulate near the foothills or the gentler slopes and form a conical heap is called mass wasting. Two types of mass movements are there- Rapid and slower mass movements.
Q 2. Write whether the statements are true or false. Correct the incorrect ones.
(a) Climate affects earthquakes. –FALSE
Plate tectonic theory is responsible for earthquakes.
(b) Mechanical weathering is less effective in humid climates.-TRUE.
(c) Mechanical weathering happens on a large scale in dry climates.-TRUE
(d) The breaking down of rocks into smaller particles is called weathering.-TRUE
(e) Lateritic rocks are formed through exfoliation.-FALSE
Lateritic rocks are formed through Chemical weathering.
Q 4. Identify the type of weathering from the given description.
(a) Some animals live inside the grounds by making burrows. –Biological weathering.
(b) The rock rusts.-Oxidation
(c) Water which has accumulated in the crevices of the rocks freezes. Consequently, the rock breaks.-Mechanical Weathering.
(d) The pipes supplying water in colder regions break. –Mechanical Weathering.
(e) Sand formation occurs in deserts-Mechanical weathering.