Q1
What does weathering do?
ABreaks down rocks over time
BBuilds up rocks
CMelts rocks instantly
DNothing to rocks
ICSEClass 7 (ICSE)GeographyCh 8 · Topic 1
Weathering and Soil Formation
Weathering breaks down rocks into smaller pieces over time, and this broken material, combined with organic matter, forms soil essential for
Core concept
Physical weathering breaks rocks apart through processes like temperature changes, freezing water, or wind and water erosion.
How it works
Chemical weathering breaks down rocks through chemical reactions, like rainwater dissolving certain minerals over time.
Why it matters
Soil forms as weathered rock particles combine with decomposed organic matter (humus) from plants and animals.
Key detail
Healthy soil formation takes a very long time and is essential for agriculture, since plants need soil to grow and get nutrients.
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• Weathering breaks down rocks over time.
• Physical weathering: temperature changes, freezing water.
• Chemical weathering: chemical reactions like rain dissolving minerals.
• Soil forms from weathered rock and organic matter.
• Organic matter is called humus.
• Soil formation takes a very long time.
• Soil is essential for agriculture.
• Plants need soil for nutrients.