Carbon Cycle quiz
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What is marsh gas mostly made of?
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More questions about Carbon Cycle
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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What gas fizzes out when acid touches limestone?
Answer: Carbon dioxide
Why: Geologists drip dilute hydrochloric acid on rocks in the field; a fizz reveals carbonate minerals such as calcite.
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How does most of the fat you lose leave the body?
Answer: Breathed out
Why: The other 16% becomes water, which leaves in urine, faeces, sweat, breath and tears.
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When does Mauna Loa's CO₂ usually peak each year?
Answer: May
Why: It then sinks to its yearly low in September or October, after a summer of growth by northern plants.
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Where does most of the mass of burnt wood go?
Answer: Into the air
Why: Its carbon and hydrogen join oxygen from the air and escape as CO₂ and water vapour, leaving mostly minerals as ash.
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How many times more carbon than the air does the ocean hold?
Answer: About 50 times
Why: About 98% of that carbon is dissolved inorganic carbon, mostly bicarbonate, rather than carbon in sea life.
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Which shell mineral dissolves faster than calcite as seas acidify?
Answer: Aragonite
Why: Because sea butterflies build shells out of aragonite, their thin casings dissolve long before calcite-based shells do.
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