Peppermint and peppermint oil are LIKELY SAFE when taken by mouth in amounts commonly found in food, when taken in medicinal amounts, or when applied to the skin. The leaf is POSSIBLY SAFE when taken in amounts used for medicine short-term (up to 8 weeks). The safety of using peppermint leaf long-term is unknown.
Itâs clear that in order to have the current balance of elements that Earth has further up, the core must be 85 percent iron and 10 percent nickel. That has meant that 5 percent of it has remained up for grabs, so to speak, to anyone who can come up with a convincing enough theory.
The core of the Earth is the center. The inner core is solid, and is 90% iron. But the outer core is a liquid... and it's a good thing it is! More on that later. The outer core is made of a mixture of iron and nickel, with smaller amounts of silicon and oxygen. The outer core officially begins at a depth of 2550 km below the surface of the Earth, down to a final depth of 4750 km at the boundary between the inner and outer core.