From the standpoint of Physical Geography, the Earth can be seen to be composed of four principal components: Atmosphere, Biosphere, Lithosphere, and Hydrosphere. SMOG: The combustion of fossil ...

This image shows blue spheres representing relative amounts of Earth's water in comparison ... mostly in the form of water vapor, is in the atmosphere at any one time. If it all fell as ...

In the realm of science fiction, Dyson spheres and ringworlds have been staples ... the mass of Jupiter—at twice the distance of Earth from the sun. Depending on its density, the shell would ...

Under pressure Illustration of how helium atoms (pink spheres) are incorporated within ... planet first formed would have quickly diffused through Earth’s interior, before escaping into the atmosphere ...

Exoplanets come in extreme forms—lava spheres, diamond cores, and even planets that rain molten iron—but some are eerily Earth-like and ... found that a thick atmosphere can make a planet ...