Answer: A
Explanation: We know that f=p*n
f=50*300=15000 Hz = 15kHz.
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I think its Mercury because it's the closest to the sun.
Answer:
Formation of new elements
Explanation:
It's a hardness scale from 1-10 determining how easy or hard it is to scratch the mineral.
Remember that talc (like chalk or baby powder) is the softest and easiest to scratch then diamond being 10 is the hardest mineral to scratch or break or cut
The heat from your hand causes the ice molecules to heat up and become more active. This lowers the stability of the ice cube compound causing it to melt.
