Answer:
absolute brightness
Explanation:
The observational fact about a cepheid variable star that leads to a measurement of its distance from earth is that its period of variation is directly related to its absolute brightness
The answer to this is all of these because there are a lot of theories about plate tectonics and I believe those answers above is one of them so it should be C.
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Mantle convection is an important method of heat transport within the Earth. Mantle convection is the driving mechanism for plate tectonics, which is the process ultimately responsible for producing earthquakes, mountain ranges, and volcanos on Earth.
Answer: d) 4000MW
Explanation:
The attachments below shows the Table that completes this question and a brief calculation explaining the answer.