The core of Earth is made out of iron and nickel. The outer core's
temperature is so hot that it melts the metal. The inner core is solid metal.
What causes these differences?

answer: the primary difference between a hypothesis and a theory is that b hypothesis is falsifiable, but a theory has been proven to be correct. theory is an explanation of something that is happening but hypothesis is a guess of something that can happen

explanation:

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1. they vary with a higher number because boiling is way hotter than melting