1. The temperatures vary from subzero levels in polar areas and high altitudes, to about 50°C in tropical deserts during summer.
2. There are also seasonal changes in the temperature.
3. Temperature also shows progressive decrease from the equator towards the poles and from plains to the mountain tops.
4. Some unique habitats such as hot springs may show very high temperatures of about 80 to 100°C
5. In deep-sea hydrothermal vents average temperatures may rise up to 400°C.
