Two Observed Features on Mars Appear to Lead to Contrary

question 4

Multiple Choice

Two observed features on Mars appear to lead to contrary geological conclusions-the appearance of massive, solitary volcanoes, apparently caused by hot spots under the planet's surface, and the discovery of a long, deep rift valley across the planet. Why are the two features a contradiction?

• A) Volcanoes suggest a molten inner planet, whereas a rift valley suggests the presence of a solid core.
• B) Massive volcanoes should have covered the planet's surface, including the valley, with dust and ash, but the valley remains as a major feature.
• C) Ancient volcanoes show no sign of erosion by water, whereas the valley suggests prolonged rainfall and erosion.
• D) Single massive volcanoes indicate hot-spot volcanism with no plate tectonic motion, whereas a rift valley suggests otherwise.

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