Under Similar Warm, Moist Climatic Conditions, Why Would Basalt and Gabbro

question 6

Multiple Choice

Under similar warm, moist climatic conditions, why would basalt and gabbro generally have higher chemical weathering rates than rhyolite and granite?

• A) The plagioclase feldspars in the granite and rhyolite decompose readily to clay minerals and iron oxides.
• B) The potassium feldspars and quartz in the rhyolite and granite are more susceptible to cracking by frost wedging.
• C) The ferromagnesian minerals in the gabbro and basalt are subject to oxidation and chemical breakdown.
• D) The quartz in the gabbro and basalt decomposes very quickly.

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