Question

Which of the following statements about permafrost is true? Choose one: A. It can extend as deep as 1,500 km below ground surface. B. Permafrost that thaws and refreezes produces a pentagonal or hexagonal ground surface pattern called columnar joints. C. It is rare in periglacial environments. D. It can melt to a depth of a few meters in summer, then refreeze in winter.

Answer 1

D. It can melt to a depth of a few meters in summer, then refreeze in winter.

Explanation:

Permafrost can melt to a depth of a few meters in summer and then refreeze in winter. Permafrost is soil or ground that remains frozen for at least two years.

• They occur at high latitude regions where temperature is usually below that of freezing point.
• Permafrost are usually a few meters deep and do not extend as deep as 1500km. This is the depth of the mantle.
• Columnar joints are produced by differential cooling of volcanic rocks and not hexagonal patterns of freezing and thawing melt.
• Permafrost can be found in periglacial area.

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