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staedtler staedtler
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7 years ago
An unusual surface feature so far found only on Mercury among the planets and moons in our solar system is

(a)   a set of long, meandering cliffs which often cross other surface features such as craters.
(b)   an immense, extinct volcano hundreds of kilometers across and more than 20 kilometers high.
(c)   an immense set of rift valleys stretching about 1/4 of the way around the planet=s equator.
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Discovering the Universe

Discovering the Universe


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hyponoticahyponotica
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staedtler Author
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7 years ago
Grinning Face Exactly what I needed
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