Social Sciences and History / Unit 10 SSH 0926 short lesson, about 20 seconds
Mechanical and Chemical Weathering; Soil
Captions available
The idea
Weathering is rock meeting the surface: mechanical breakdown into fragments, and chemical change of minerals into forms stable at the surface. Its products are sediment and soil, a mixture of about forty-five percent minerals, five percent organic matter, and fifty percent pore space.
In practice
Sand, silt and clay as soil texture.
Where people slip
Warm climates, chemical weathering, clay-rich soils.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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