KIDS QUIZ
SPACE EXPLORATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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There is evidence of erosion from floods on Mars. What does this mean?
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Liquid water was present at one time
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Liquid water is present now
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Liquid water has evaporated
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Liquid water must never have been present
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Explanation:
Detailed explanation-1: -Valley networks are found only on the ancient cratered terrains of Mars (southern hemisphere; ages of 3.5-4 BY). The valley networks, first observed by Mariner 9 in 1972, provided the first evidence that Mars had liquid water running across its surface 4 billion years ago.
Detailed explanation-2: -The red planet once had a global ocean, rivers, and lakes. Then, the solar wind-charged particles from the Sun-stripped away the Martian atmosphere. As the planet’s protective shield faded, all liquid water on the surface evaporated into space, merged with minerals, or fled underground to become water ice.
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