Mississippi River is the longest river in North America
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One thing they COULD do is have the St.Louis and Houston Stations both send out very high wave frequencies and figure out from there what the magnitude is and send it back to LA, but that might take a bit of time, depening on if power cables aren't down.
Answer:
d.His weight will be 15kg; this is because moon’s gravity is 1/6th as compared to that of the earth.