People like to ____ Mars to understand its secrets. Mars has big ____, like giant stones. The ____ on Mars are deep, like canyons. The air on Mars is ____, so it's hard to breathe. That is a ____ drawing. Mars has ____ in its atmosphere that makes it hazy. Discovering ice on Mars is ____ for scientists. Water is ____ for life to exist on a planet. ____ help us explore places like Mars without humans. People are planning to go to Mars in the ____.

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