Geology quiz
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Which mountains rose when India crashed into Asia?
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More questions about Geology
These visible examples show the question style. LearnClash turns the full topic into ranked duels and spaced repetition.
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What did most crude oil form from?
Answer: Plankton
Why: Buried plankton turns into oil mainly within the oil window, at roughly 60 to 120 °C.
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Which gas do volcanoes give off the most?
Answer: Water vapor
Why: Together with carbon dioxide and sulfur dioxide, water vapor makes up 99 percent of the gas molecules a volcano emits.
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Which mineral is the most abundant in the whole Earth?
Answer: Bridgmanite
Why: Despite being so common, it was only named in 2014, after natural crystals turned up in a meteorite.
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What rock can float on water?
Answer: Pumice
Why: Pumice is frothy lava that cooled so fast its gas bubbles froze in place, leaving a rock riddled with holes.
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Which element is most common in Earth's crust?
Answer: Oxygen
Why: It is locked in rock: silicate minerals, built from silicon and oxygen, make up more than 90 percent of the crust.
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Which mineral grains from Australia are 4.4 billion years old?
Answer: Zircon
Why: Zircon takes in uranium but strongly rejects lead as it grows, so the lead inside comes from decay and dates the crystal.
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