Erosion and Weathering quiz
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Whose 1881 book showed earthworms help wear down the land?
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More questions about Erosion and Weathering
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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Which gravestone rock does acid rain slowly dissolve?
Answer: Marble
Why: Marble is mostly calcite, which reacts with even weak acids, while granite's quartz and feldspar resist them.
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How long does Mount Rushmore's granite take to erode 2.5 cm?
Answer: About 10,000 years
Why: Crews seal its cracks with silicone caulk, because water freezing inside them would slowly wedge the granite apart.
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Why do hoodoos bulge and narrow along their height?
Answer: Uneven rock layers
Why: At Bryce Canyon, each layer holds a different amount of calcium carbonate cement, and slightly acidic rain dissolves the weakly cemented layers faster.
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Where does most of the sea's salt come from?
Answer: Rocks on land
Why: Slightly acidic rain slowly breaks down rocks on land, and rivers carry the freed salts down to the sea.
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Which rock locks away carbon that weathering takes from the air?
Answer: Limestone
Why: This slow carbon cycle works like a planetary thermostat, but it takes a few hundred thousand years to act.
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What does feldspar turn into by chemical weathering?
Answer: Clay
Why: Unlike feldspar, the quartz grains in granite are virtually untouched by chemical weathering.
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