On what basis and how are the orbits of artificial stellites classified?
Low earth orbits:

Explanation

Depending on the height of the satellite 's orbit above the earth's surface , the satellite orbits are classified as below :
(a) If the height of the satellite orbit above the earth's surface is between 180 km and 200 km , the orbits are called low earth orbits.
(b) They complete one revolution in around 90 minutes.
(c) The satellites used for scientific experiments and atmosheric studies revolve in low earth orbist. International Space Station and Hubble telescope also revolve in low earth orbits.