What did Alfé at University College London hypothesize? What did Alfé use?
How fast is the inner core cooling?
How old is the Earth?
What did Alfé and his team use to draw their conclusions?
What question do you have after reading this?

2) how fast is the inner core cooling?As the Earth cools from the inside out, the molten outer core is slowly freezing. This is leading the solid inner core to grow at a rate of approximately 1 millimeter per year.

3) how old is the Earth? Earth is estimated to be 4.54 billion years old, plus or minus about 50 million years. Scientists have scoured the Earth searching for the oldest rocks to radiometrically date.

this is what I could answer. try to answer the other questions.

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answer; /// i believe the correct answer is flash your high beams at them.or tap your horn;

the first question's answer is a.