Caloris Basin,a Huge Circular Region on Mercury Surrounded by Rings

question 7

Multiple Choice

Caloris Basin,a huge circular region on Mercury surrounded by rings of mountains,appears to have been produced by

• A) the impact of a massive object in the early phases of the planet's formation,soon after the initial cratering period.
• B) wind erosion from huge atmospheric storms,similar to super-hurricanes on Earth or the Great Red Spot on Jupiter.
• C) successive expansion and contraction of the planet's surface by intense solar heating and severe cooling as the planet rotated,causing buckling in a similar way to the formation of the North American Rocky Mountains or the South American Andes.
• D) the lava flow from a large and long-lived volcano that formed the mountains in a similar manner to the formation of the Hawaiian Islands on Earth.

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