Q1
What is physical weathering?
ABreaking rocks via temperature or freezing water
BChemical reactions breaking rocks
CMoving weathered material
DNo physical process
ICSEClass 9 (ICSE)GeographyCh 7 · Topic 1
Weathering and Denudation
Weathering breaks down rocks in place, while denudation includes weathering plus erosion, gradually wearing down and reshaping Earth's surfa
Core concept
Physical weathering breaks rocks through processes like temperature changes, freezing water, or plant roots growing into cracks.
How it works
Chemical weathering breaks down rocks through chemical reactions, like rainwater dissolving certain minerals over time.
Why it matters
Denudation combines weathering with erosion (the movement of weathered material by wind, water, or ice) and transportation of sediments.
Key detail
These processes continuously reshape Earth's surface, creating features like valleys, canyons, and gradually wearing down mountains over time.
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• Physical weathering breaks rocks via temperature, freezing water, roots.
• Chemical weathering uses chemical reactions.
• Example: rainwater dissolving minerals.
• Denudation combines weathering and erosion.
• Erosion moves weathered material by wind, water, ice.
• Transportation moves sediments further.
• These processes reshape Earth's surface.
• They create valleys, canyons and wear down mountains.