Answer:
The effort put by scientist and sailors about earth is that they keep on going round the earth and putting their lives in danger and some even give their lives.
Explanation:
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Answer:
people may get sick or kill their crops by using water thats from unfilter or unsustainable, they're could sometimes be bad chemicals and bacteria in the water
I only know 2 and 3 are correct. I’m not sure about the last one.
B, ocean trenches are formed after a underwater volcano has erupted.<span />