Nickel
nickel
NICKEL
Nickel
Nickel
Nickel
NICKEL
NICKEL
Components of the earth that changed the least over time include the earth's crust and mantle and the structure of the earth's interior. Other structures that have changed very little include the components of the atmosphere.
mesosphere
The heaviest ones.
The outer core, inner core, mantle, crust, water, atmosphere. This is the order from densest to least dense.
oxygen