Ch. 10 Terms

Ch. 10 Terms - NR 130 Key Terms Chapter 10 Weathering the...

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NR 130 Key Terms Chapter 10 Weathering: the process that decompose rocks and convert them to loose gravel, sand, clay, and soil Erosion: process that picks up and carries off weathered rocks and minerals Mechanical (Physical) Weathering: reduces solid rock to small fragments but does not alter the chemical composition of rocks and minerals Chemical Weathering: occurs when air and water chemically react with rock to alter its composition and mineral content (rusting of knife blade) Pressure-release Fracture: Process when the pressure decreases in the rock, the rock expands, but because the rock is now cool and brittle, it fractures as it expands Frost wedging: water accumulates in a crack and then freezes, the ice expands Talus: large piles of loose angular rocks (rocks that fall from cliffs usually as a result of frost wedging) Abrasion: the mechanical wearing of rocks by friction and impact Organic activity: when soil collects in a crack in bedrock, a seed may sprout and the roots work their way into the crack, expand, and may eventually widen the crack (tree roots rise to crack sidewalk) Thermal expansion and contraction: when rocks expand when heated and contract when cooled, it may fracture the rock Dissolution: some minerals dissolve readily in water while others do not
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Ch. 10 Terms - NR 130 Key Terms Chapter 10 Weathering the...

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