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Checkpoint C: sources and one claim

Open the real source, quote the passage about the claim, separate source information from the answer’s inferences, and classify the claim.

CheckpointAbout 20 min

The task contains an AI answer for a school presentation and its two sources. The answer and source 2 are fictional. Source 1 is a real NASA page that you will open yourself. Do the task in your own notes.

Question and answer

Question: “How long are a day and a year on Mars?”

Answer: “A day on Mars is as long as an Earth day, exactly 24 hours [1]. Mars orbits the Sun in 687 Earth days, so a year there lasts almost two Earth years [1]. That means Mars has twice as many seasons as Earth [2].”

Sources

  • [1] NASA Science: Mars: Facts.
  • [2] A space enthusiast’s blog post, “Wonders of Mars,” with no date or author information.

The page is in English. Find the passage that says how long Mars takes to rotate once on its axis.

Open source 1: NASA Science, Mars: Facts (opens in a new tab)

What to do

  1. 1

    Check the claim about the length of a day

    Open source 1 and quote the passage that states the length of a day on Mars.

  2. 2

    Separate sources from inferences

    Write down who published each source and when, which information the answer attributes to sources 1 and 2, and what it inferred on its own.

  3. 3

    Classify and decide

    Classify the claim as supported, partially supported, contradicted, or unverified. Write whether you would use it, clarify it, or leave it out, and note what remains unresolved.

What to demonstrate

  • One checkable claim written as a sentence, with a quotation from source 1.
  • An account of who published each source and when, what the response attributes to each source, and what it inferred itself.
  • The claim's classification, your decision, and what remains unresolved.

Check before you continue

  1. Do you know who published the sources, and did you separate what they say from what the response added?
  2. Did you open the original source and find the passage relevant to the claim?
  3. Do you know whether the source fully supports, partly supports, or contradicts the claim, and what you will do with it?

Evidence of skills

Research with visible sources, Verify a claim against its source

Sources and review

Reviewed:
September 11, 2026

Sources