Curlie

Oxygen

Oxygen was generally thought to be discovered in 1774 by Joseph Priestly, but was also independently identified by Scheele. It is the third most abundant element in the Sun and plays an important role in the carbon-nitrogen cycle in plants.

This category contains sites about the element Oxygen.

All sites submitted to this category should be of interest to and appropriate for children under the age of 18. Please remember that no site is guaranteed placement in the Kids and Teens section of the Open Directory.

Sites that are primarily designed to sell products or services will not be listed in any branch of Kids and Teens.