Whois & Analysis for physicalgeography.net

A lithosphere ([lithos] for "rocky", and [sphaira] for "sphere") is the rigid, outermost shell of a terrestrial-type planet or natural satellite that is defined by its rigid mechanical properties.

On Earth, it is composed of the crust and the portion of the upper mantle that behaves elastically on time scales of thousands of years or greater.

The outermost shell of a rocky planet, the crust, is defined on the basis of its chemistry and mineralogy.

The hydrosphere (from Greek ὕδωρ - hydōr, "water" and σφαῖρα - sphaira, "sphere") is the combined mass of water found on, under, and above the surface of a planet, minor planet or natural satellite.

Physical geography (also known as geosystems or physiography) is one of the two major sub-fields of geography.

Physical geography is that branch of natural science which deals with the study of processes and patterns in the natural environment like the atmosphere, hydrosphere, biosphere, and geosphere, as opposed to the cultural or built environment, the domain of human geography.

The biosphere (from Greek βίος bíos "life" and σφαῖρα sphaîra "sphere") also known as the ecosphere (from Greek οἶκος oîkos "environment" and σφαῖρα), is the worldwide sum of all ecosystems.

The two joined words are "bio" and "sphere".

It can also be termed as the zone of life on Earth, a closed system (apart from solar and cosmic radiation and heat from the interior.

An atmosphere is a layer of gases surrounding a planet or other material body, that is held in place by the gravity of that body.

An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is low.