Different rock types shape the landscape, from steep moors to fertile lowlands. This GCSE Geography quiz explores how rocks influence landforms, soils, and human land use.
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It is an impermeable rock that weathers only slowly, forming poor soils. As it is resistant to weathering, it usually forms areas of high land or even mountains
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On the granite moorland of Dartmoor, there are at least 150 tors. These are rock outcrops formed by a combination of freeze-thaw weathering and hydrolysis that have not become covered in vegetation
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Granite is impermeable
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Layers of clay in porous or permeable rocks can trap liquids like oil and water underground
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Any rain falling on to a chalk landscape will be absorbed into the ground
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Layers of chalk that are underground form good aquifers (areas underground that allow the storage of water because the rock is porous)
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Carboniferous limestone is permeable so water will often end up underground by going down swallow holes, leaving dry valleys. Gorges form when the roof of an underground watercourse or cave collapses
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Carbon dioxide (and pollutants like sulphur dioxide and nitrogen oxides from burning fossil fuels) make rainwater slightly acidic. This reacts chemically with the limestone, dissolving it away along lines of weaknesses like joints and bedding planes
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Granite forms upland areas where rainfall tends to be high. Since granite is impermeable, the rain forms many streams and rivers
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There are two clues in the question. Firstly, waterlogging that lasts more than a few days suggests that the rock underneath is impermeable so that makes limestone and chalk less likely. Secondly, the fact that she was looking at fields of barley means it is not likely to be granite as that is not suitable for arable farming (nor are limestone and chalk so that also backs up her guess). That leaves clay
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