Answers

2015-07-07T20:03:03+08:00
It is liquid because of its temprature / it is very hot in the center of the core
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2015-07-07T20:03:27+08:00
It is the outer core that it is liquid
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Scientists found out that the OUTER CORE IS LIQUID (not inner core) because of the S-waves. S-waves cannot travel through any liquid medium thats why they found out that the outer core is liquid. Thank you.