Battery based heaters use electric resistance heating, which uses a lot of current (electricity) to create the heat.
I am pretty sure that the only statement which is true for particles of the medium of an earthquake P-wave is being shown in the option : b)vibrate parallel to the wave, forming compressions and rarefactions. As you know, it can be formed in two ways : from alternating compressions and rarefactions or primary wave. I bet you will agree with me.
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Explanation:
Same numbers of protons but different number of neutron so i would go for A same atomic number different number of neutrons
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