Mars Orbiter Finds Gas Near Alba Mons Volcano
Scientists say gas detected above cracks may come from volcanic activity below the surface.
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A has of a the . A the in a by the on 4.
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The has . It is not of an : no or have been on the .
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Try 2 questions about this story, then explain one idea in your own words. Check the text whenever you need to.
In this lesson: Identify the measured gas and the images used alongside it.
Grammar in this story: Present perfect: has/have + participle
has detected traces of a gas called hydrogen chloride
The present perfect connects an earlier event with the situation being discussed. Example: “The team has found a new clue.” It does not itself give the event’s exact time.
Your turn
Explain the possible underground source of the gas and why the finding is not proof of an eruption.
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The gas might escape from hot rock deep underground. The finding is not proof of an eruption because no new lava flows or eruptions have been observed on Mars.
Your answer can be different. Give a reason and use your own words.
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