Q1
What is weathering?
ABreaking down rocks in place
BMoving rocks to new places
COnly forming new rocks
DOnly creating mountains
SSCClass 9 (SSC)Geography (भूगोल)Ch 3 · Topic 1
Exogenetic Processes - Part I
Exogenetic processes are external forces like weathering and erosion that shape Earth's surface from outside, wearing down and transporting
Core concept
Weathering is the breaking down of rocks in place, without movement, caused by physical (temperature changes), chemical (reactions), or biological factors.
How it works
Physical weathering includes processes like frost action, where water freezes and expands in rock cracks, breaking the rock apart.
Why it matters
Chemical weathering involves chemical reactions, like oxidation (rusting) or dissolution, that break down rock minerals over time.
Key detail
Erosion, unlike weathering, involves the movement of broken-down material by agents like water, wind, or ice to new locations.
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Quick notes
• Weathering: breaking down rocks in place.
• Types: physical, chemical, biological.
• Physical: frost action, temperature changes.
• Water freezes, expands, breaks rock.
• Chemical: oxidation, dissolution reactions.
• These break down minerals over time.
• Erosion: moves broken material elsewhere.
• Agents: water, wind, ice.