Soil quiz
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About how much of our food comes from soil?
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More questions about Soil
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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What crops add nitrogen to the soil?
Answer: Legumes
Why: Nodules on legume roots house rhizobia bacteria, which turn nitrogen gas from the air into ammonia the plant can use.
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What wiped out native earthworms around North America's Great Lakes?
Answer: Ice Age glaciers
Why: Nearly every earthworm there today is a newcomer: non-native species from Europe and Asia, brought in by people.
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Whose 1883 black earth study laid the basis of soil science?
Answer: Vasily Dokuchaev
Why: His key idea: climate, vegetation, relief and time, not the parent rock alone, decide which soil forms.
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What mainly makes the earthy smell of soil after rain?
Answer: Bacteria
Why: Geosmin is the compound behind it, released mostly by Streptomyces bacteria living in the soil.
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What makes the Amazon's human-made terra preta black?
Answer: Charcoal
Why: Charcoal barely breaks down, so it has stayed in the soil for centuries, helping it hold nutrients rain would wash out.
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Which tropical soil hardens in air and is cut into bricks?
Answer: Laterite
Why: Its name comes straight from the Latin word later, which means brick.
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