Answer:
Explorers dealt with challenges when finding money for their voyage, navigating in uncharted waters, and surviving the long, dangerous journey.
Explanation:
The text talks about exploration and how sailors went through many challenges especially when they didn't know what they were getting into.
The primary energy source in the US is fossil fuels, such as coal and oil. Hydroelectic and solar are very very small in comparison (about 10 to 15 times less of those is used than fossil fuels).
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The legislative branch has the power to impeach the president. I hope this helped