the middle sphere is between the asthenosphere and the outer core!
No, it is the outermost sphere of the earth.
sphere
sphere, round
The hydrosphere encompasses all of Earth's water.
hemisphere.
Celestial Equator
It is the diameter of the circle or the sphere
The hydrosphere.
Hydrosphere
Hydrosphere
GRAVITY! (pulling you towards the Earths centre)
You may be referring to the geosphere.