<Li> Thermosphere: Mesosphere to 675 kilometres (419 mi) </Li> <Li> Exosphere: Thermosphere to 10,000 kilometres (6,200 mi) </Li> <P> The Kármán line, at an altitude of 100 kilometres (62 mi) above sea level, by convention defines represents the demarcation between the atmosphere and space . The thermosphere and exosphere (along with the higher parts of the mesosphere) are regions of the atmosphere that are conventionally defined as space . </P> <P> Regions on the Earth's surface (or in its atmosphere) that are high above mean sea level are referred to as high altitude . High altitude is sometimes defined to begin at 2,400 meters (8,000 ft) above sea level . </P>

What is the difference between height and altitude