1.crust
2. mantle
3. outer core
4.inner core
True, fatty acids arent able to get to the brain cells because of the blood braid barrier,, ketone bodies produced by the liver are the only other energy sources, though they arent nearly as proficient.
Water purification is the process of removing undesirable chemicals, biological contaminants, suspended solids, and gases from water. The goal is to produce water fit for specific purposes.