Page 134 - Science Course 2 (Book 2)
P. 134
Mo11-L2a: How Does Weathering Affect Earth’s Surface?
The upper part of the soil contains
O-Horizon more organic material than the
Loose and partly decayed organic matter. lower part. The lower part of
the soil also can contain
weathered rock.
A-Horizon
mineral matter mixed with some hunts
E-Horizon
Light colored zone of leaching Over time, plants and other
organisms in the soil die and
decompose. The upper part of
B-Horizon the soil contains nutrient-rich
accumulate of clay from above organic material.
C-Horizon Warm, wet climates produce soil fastest.
Partially altered parent material
Large amounts of rain can speed weathering of
rocks, and chemical reactions are faster in warmer
R-Horizon
Unweathered parent material temperatures.
High Weathering
Soil formation begins when physical and chemical
weathering break down rocks.
Weathering processes fracture and break down rock.
Soil formation can takes hundreds or thousand of
year. Low Weathering
Plants, bacteria, and burrowing organism help break Key Concept
down rock.
How Does Weathering Affect Earth’s Surface?
How are weathering and soil formation related?
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