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Elements

This category contains sites about the element Carbon.

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.

Carbon

Carbon is very widely distributed in nature. It is also found in suns, stars, comets and most planets. Carbon has three allotropic forms: graphite, diamond and fullerines.

This category contains sites about the element Carbon.

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.

Hydrogen

Hydrogen was recognized as a distinct element by Henry Cavendish in 1776. It is one of the most abundant substances in the Universe.

This category contains sites about the element Hydrogen.

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.

Nitrogen

Nitrogen was discovered in 1772 by Daniel Rutherford. Nitrogen makes up 78% of the Earth's air. Nitrogen is found in all living systems as a component of biological compounds.

This category contains sites about the element Nitrogen.

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.

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.