<u>The outer core of the Earth is a liquid layer and it is mainly made up of the metals iron and nickel. </u>
<u>It's also made up of small amounts of other substances. </u>
<u>The outer core is responsible for Earth's magnetic field. </u>
<u>The outer core is the second layer of the Earth.</u>
It is d because pesticides run off into water, they are absorbed into soil , and they are left in the air , hope this helps :)
-Each layer is younger than the one below it.
When organic molecules decompose, energy is released.
