Q.4) Give geographical reasons :
1) Temperature is the main factor behind
granular weathering.
2) Human is an agent of weathering.
3) Slope is a major factor in mass wasting.
4) Oxidation changes the size and colour of the
rocks.
5) Effect of mass movement will be greater
along the western slope of the Sahyadris
than the eastern slope.
Answers
Explanation:
A. Continental Dynamics / Landscape Evolution
1. Mass Transfer Functions
a. Dynamic interaction between uplift of earth's crust, or emergence on crust,
and erosion of materials from higher elevations and moving them to lower
elevations
b. mass transfer = energy driven
B. Weathering - disintegration and decomposition of rock at or near the surface of the earth,
fragmenting rock into particles via physical and chemical processes
1. In-situ ("in place, without transport") disintegration of rock or unconsolidated
materials
2. Earth Surface Conditions
a. Water-rich Atmosphere and Hydrosphere
b. Low Temperature
3. Water - universal solvent, very effective at chemically altering rocks
C. Sediment - fragments of rocks and/or minerals that are produced from the weathering of
pre-existing rock
1. Grain Size Classification According to Clast Diameter (from large fragments to
small)
a. Gravel: pebble to boulder size range (>2 mm)
(1) boulders: > 256 mm (25.6 cm)
(2) cobbles: 16 mm - 256 mm
(3) pebbles: 4 mm - 16 mm
(4) granules: 2 mm - 4 mm
b. Sand: 0.0625 mm to 2 mm in diameter
c. Silt: 4 micrometers (0.004 mm) to 0.0625 mm)
d. Clay: < 4 micrometers in diameter
D. Erosion - incorporation and transportation of sediment by a mobile agent, driven by
mechanical energy
1. Surface Agents of Transportation and Erosion
a. Wind (eolian)
b. Water (river-fluvial)
c. Ice (glacial)
d. Gravity (mass wasting = transfer of surficial material downslope under the
influence of gravity)
(1) also drives flow of water and ice
E. Denudation of earth's surface: physical systems driving towards equilibrium: in this
case the system includes elevating the earth's surface to provide potential energy, with
subsequent driving towards peneplanation via gravity, water, and weathering.
Explanation:
temperature is the main factor behind granular weathering