<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 makes a longitudinal wave because it stretches and compresses while it slithers forward
Most of legumes have symbiotic, nitrogen-fixing<span> bacteria, that live in structures called "</span>root nodules"<span>. </span>
