Answer:
The earth has different layers because as it formed, the lighter parts (like continental crust) floated to the surface, and the really heavy parts (like iron and nickel in the core) sank to the middle. It is just like when you mix oil and water: the oil will float to the surface because it is lighter (or less dense) than the water.
Answer:
Ozone
Explanation:
A molecule contains at least two different types of elements, but ozone only contains one
We need cells for every day function. This includes significant processes like growth and development or protection from disease
A or the balance between organic matter and mineral matter
Animals depend on food and without food it will break our animal food source chain. for example cows depend on hay and lions depend on meat from cows or something like that