| 1. | Only a fraction of the permafrost zone consists of actual ground ice.
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| 2. | Methanol can only remove frost and light ground ice prior to flight.
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| 3. | Small amounts of liquid water from melted ground ice could be enough.
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| 4. | These scale differences may indicate local difference in ground ice concentrations.
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| 5. | Crater shapes can reveal the presence of ground ice.
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| 6. | A study supported formation by the melting of ground ice or snowpack as the chief cause.
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| 7. | These pits may have formed when ground ice converted to a gas, thus leaving a void.
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| 8. | This supports the proposition of ground ice in the near surface of Mars in this area.
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| 9. | So-called " Rootless cones " are caused by explosions of lava with ground ice under the flow.
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| 10. | Volcanic activity within Mars could have melted the ground ice, causing parts of the crust to collapse.
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