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MMLU / Why do scientists think Mars was once warmer and wetter?

Problem

Answer published by the source. Consult the official source to check your work against its answer.

question

Why do scientists think Mars was once warmer and wetter?

choices

  1. Mars shows evidence of significant volcanism which implies that the climate was once warmer and therefore wetter
  2. early observations showed what appeared to be changing vegetation patterns and canals indicating the presence of water
  3. there are many geologic features on Mars that are difficult to explain unless liquid water was once stable at the surface
  4. all planets tend to begin with warm wet climates and gradually become cold and dry with smaller planets cooling faster than larger planets

subject

astronomy

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Source and history

task_id
0c02a642-6db1-52cb-8ac5-f82809237725
task_key
all--test--0c02a642-6db1-52cb-8ac5-f82809237725
task_revision_id
1
config / split
all / test

Official source

initial import