How does the radioactive heating of Earth vary from when it was first formed 4.6

Question

How does the radioactive heating of Earth vary from when it was first formed 4.6 billion years ago until today?

a.Radioactivity decreases with time

b.As time continues Earth's interior continues to cool

c. The more radioactive decay, the more radiocative products and Earth's core will continue to heat up

d. Eventually radioactivity will lead to a chain reaction and Earth will explode

e. Both a and b

F. Both c and d

How do we know that Earth's magnetic field has flipped its polarity many times in the past?

a.Magnetic striping of alternate magnetic field directions that we observe in rocks on the seafloor

b.Compasses have been observed to flip during field reversals

c. Ships at sea have become lost(particularly in the Bermuda Triangle) whenmagnetic direction finding vanished during field flips

d. Submarines measure different directions for the magnetic fieldi in the Northern Hemisphere and in the Southern Hemisphere.

Explanation / Answer

1) Both a and b.

a.Radioactivity decreases with time

b.As time continues Earth's interior continues to cool

As the time goes on, the radioactivity will decrease and less heat will be emitted.

2)a.Magnetic striping of alternate magnetic field directions that we observe in rocks on the seafloor

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