You may be offered hip replacement surgery if: 1  you have severe pain, swelling and stiffness in your hip joint and your mobility is reduced. 2  your hip pain is so severe that it interferes with your quality of life and sleep. 3  everyday tasks, such as shopping or getting out of the bath, are difficult or impossible.
The Earth is made up of four distinct layers: 1  The inner core is in the centre and is the hottest part of the Earth. 2  The outer core is the layer surrounding the inner core. 3  The mantle is the widest section of the Earth. 4  The crust is the outer layer of the earth.
Quick Answer. The thermosphere is the hottest layer of the atmosphere. It extends from 80 kilometers above the surface of the Earth up to 600 kilometers and can heat up to 1,500 degrees Celsius because itâs very sensitive to solar activity. The air is thin and extremely hot, and there are sparse air molecules in this layer.