Earth's inner core is solid because of the extreme pressures and underneath the earth.
In a ecological pyramid, when we move up energy decreases by 10% at each step 'cause they get lost as "Heat" when energy flows from one Trophic level to another.
Hope this helps!
Answer:
thermal
nuclear
magnetic
gravitational
chemical
mechanical
elastic
I think I'm sorry if it's wrong:(
I think the answer is oxygen, but not 100% sure
