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 consists of four concentric [concentric: Describe shapes (usually circles) which share the same centre point.] layers: inner core, outer core, mantle [mantle: A zone of hot rock in the interior of the Earth, located between the outer crust and the molten core.] and crust [crust: The outer
layerâ). The hottest region is the thermosphere, where heating of the extremely thin atmosphere is sensitive to solar activity and can produce temperatures up to 1,700 oC (3,100oF).Within the thermosphere is a region known as the ionosphere. The ionosphere is not, technically, a separate layer of the atmosphere.