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When rainwater flows over mountain rocks, what does it dissolve and carry with it?

Answer and explanation

Correct answer: Minerals and salts

Correct answer: B. Rainwater is slightly acidic because it absorbs carbon dioxide from the air, and this helps it react with some minerals in rocks. As water flows over or through rock, soluble substances such as mineral ions and salts can dissolve into it. Streams then transport these dissolved materials downhill toward lakes and oceans. This is one reason natural waters contain dissolved salts, although the exact amount depends on the rock type and local conditions. A is wrong because oxygen may be present in water but is not the main material dissolved from rocks in this process. C is wrong because insects are not dissolved substances. D is wrong because gold is not ordinarily dissolved and carried in significant amounts by normal rainwater. Memory cue: running water can wear rocks and carry their soluble minerals.

Related tags

MineralsRunoffWeatheringHydrological CycleThe Living WorldBiologyClass 11 Mcq

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