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As you descend, your instruments detect helium in the upper atmosphere and carbon dioxide in the lower atmosphere. How many layers of atmosphere will you pass through before you reach the planet's surface?

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Interesting fact:

The highest mountain discovered in our solar system is Mars’s Olympus Mons. The towering mountain is three times higher than Mount Everest! Not only is it tall, but its 374,015 square feet (114,000 square meters) wide! That’s an area approximately the size of the state of Arizona!

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