Whatâs Eating You? Chronic stomach pain isnât fun â I used to be a chronic overeater, and it was tough to teach myself to put the fork down when I started to feel full. Once I got a handle on my overeating, I still suffered from stomach pain.
A layer of the upper mantle that flows due to heat currents moving through solid rock. Outer Core. the liquid layer made up of hot liquid iron and nickel that surrounds the inner core. Inner Core. a dense ball of solid metal that is the hottest and densest layer of the Earth.
The outer and inner core are both composed mainly of iron. By measuring information from seismic waves, scientists can conclude that the iron in the outer core and inner core exist at different densities, so exist as different states of matter: liquid and solid.