For centuries, people were happy to simply accept the teachings of mythology or religion.
If you want to get an idea about a tree's age, you count its rings. In this lesson, we'll get an idea of how scientists date our planet.
One of the most basic questions is geology centers on how old the Earth is.
Each atom is understood to be made up of three basic parts.
The nucleus contains protons (tiny particles each with a single positive electric charge) and neutrons (particles without any electric charge).
Each atom has a positively charged nucleus surrounded by negatively charged electrons.