Let's say we want to build a model of the sun and Earth alone. Earth has a radius of about 6,371 kilometers (3,959 miles), but let's represent this with a marble 1 centimeter in diameter.

Explore Earth's hidden layers beneath our feet. This kid-friendly guide includes a neat diagram and fun descriptions of the 4 layers of the Earth.

This diagram easily breaks down the science of what's happening in space with the sun, moon, and Earth during the April 8 total solar eclipse.

The Earth is made up of different layers: Therefore, instead of tectonic plates moving because of the convection currents, evidence suggests it is the plates that drive the convection. Slab pull ...

Diagram showing the layers of Earth. iStock. Volcanic activity is the planet's main cooling mechanism. Certain volcanism, such as that which is still forming volcanic islands of Hawaii and Iceland ...

This diagram easily breaks down what's going on with the sun, moon, and Earth during the August 21 total solar eclipse.

This article was originally published with the title “ Population of the Earth, in Diagram ” in SA Supplements Vol. 39 No. 1006supp (April 1895), p. 16081 doi:10.1038 ...