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Rille: Quiz

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Question 1: They usually begin at an extinct ________, then meander and sometimes split as they are followed across the surface.
EarthVolcanoCalderaLava

Question 2: Sinuous rilles meander in a curved path like a mature river, and are commonly thought to be the remains of collapsed lava tubes or extinct ________ flows.
BasaltLavaIgneous rockVolcano

Question 3: They are believed to form when the ________ flows that created a mare cool, contract, and sink.
Igneous rockVolcanoLavaBasalt







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