Several of the tributary canyons of the Valles Marineris on Mars are thought to be formed:
A. when water coming from the volcanoes started flowing through the planet.
B. from impacts with irregularly shaped comets and asteroids.
C. from a chemical reaction between iron oxide and water.
D. when strong wind currents along the equatorial region started blowing out sand.
E. when ground water, escaping from opening cracks, flowed and cut a channel through the surface beneath.
Ans: E. when ground water, escaping from opening cracks, flowed and cut a channel through the surface beneath.
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Fill in the blank(s) with the appropriate word(s).
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