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All sites submitted to this category should be geared toward kids and teens under the age of 18.

No site is guaranteed placement in the Open Directory. Any site still under construction, submitted to multiple inappropriate categories, using multiple URLs for multiple submissions, or consisting primarily of affiliate links to products will be deleted.

All sites in this category are geared toward kids and teens under the age of 18 and provide information or activities related to astronomy and space.
All sites submitted to this category should be geared toward children between the ages of 3-18.

No site is guaranteed placement in the Open Directory. Any site still under construction, submitted to multiple inappropriate categories, using multiple URLs for multiple submissions, or consisting primarily of affiliate links to products will be deleted.

Chemistry web sites intended for children up to age 18 or grades K-12.
All sites submitted to this category should be geared toward kids and teens between the ages of 3-18.

No site is guaranteed placement in the Open Directory. Any site still under construction, submitted to multiple inappropriate categories, using multiple URLs for multiple submissions, or consisting primarily of affiliate links to products will be deleted.

All sites in this category are geared toward kids and teens ages 3-18 and provide information or activities related to nature and environment.
Submit only sites appropriate for children.

Do not submit sites that are designed primarily to sell books and/or other merchandise. They will not be listed.

This category lists sites that offer science experiments and projects suitable for kids.
This category is for self-help or free online help in science in general.

For sites dealing with a specific topic of science, please check to see, if there is an appropriate subcategory listed before submitting in this category.

Submit sites that will assist, in the science fields, with school studies, such as ask-an-expert, free online tutoring and self-help reading materials.
All sites submitted to this category should be geared toward children between the ages of 3-18.

No site is guaranteed placement in the Open Directory. Any site still under construction, submitted to multiple inappropriate categories, using multiple URLs for multiple submissions, or consisting primarily of affiliate links to products will be deleted.

All sites in this category are geared toward children ages 3-18 and provide information or activities related to biology, the study of life.
All sites submitted to this category should be geared toward kids and teens between the ages of 3-18.

Sites geared toward teens over the age of 18 and adults will not be listed here.

No site is guaranteed placement in the Open Directory. Any site still under construction, submitted to multiple inappropriate categories, using multiple URLs for multiple submissions, or consisting primarily of affiliate links to products will be deleted.

To measure is to compare the dimensions, quantity, or capacity with a standard. There are several systems of measurement. The two used most often are called the English and the metric systems (also called SI, or The International System). In the United States, the English system is used most often. While most other parts of the world use the metric system. The basic units used in the metric system are: Length in meters (m), Mass in kilograms (kg), and Time in seconds (s). The basic units used in the metric system are: Length in yards (yd), Weight in pounds (lb), and Time in Seconds (s). The English units of measurement have many drawbacks: the most significant is in the complexity of converting from one unit to another, such as from yards to feet.

This category is for educational and general interest websites related to Physics, its principles, laws, and applications.
Only websites with a comprehensive content (covering a variety of topics) and intended, targeted, or appropriate
for people under the age of 18 will be listed here.

Kids and Teens lists sites for kids, not about kids.

Please submit your site to the most appropriate subcategory possible depending on its topic.

Websites in this category must be in English, otherwise, submit your website to the closest category in
Kids and Teens/International depending on the language.

No site is guaranteed placement in the Open Directory.
The ODP does not list redirection or vanity URLs. Please submit the URL of your server.

Sites under construction, submitted to multiple inappropriate categories, using multiple URLs for multiple submissions, or consisting primarily of affiliate links to products will be deleted.

Thank you for your cooperation.

Physics is the science of the natural world in the broadest sense, dealing with the fundamental constituents of the universe, the forces they exert on one another, and the results produced by these forces. Physicists study a wide range of physical phenomena spanning all length scales: from the sub-atomic particles from which all ordinary matter is made (particle physics) to the behavior of the material Universe as a whole (cosmology).
Submit only sites appropriate for and of interest to children under the age of 18. Sites that are primarily designed to sell products will not be listed in any branch of Kids and Teens.
There is currently no description created for this category.
All sites submitted to this category should be geared toward children between the ages of 3-18.

No site is guaranteed placement in the Open Directory. Any site still under construction, submitted to multiple inappropriate categories, using multiple URLs for multiple submissions, or consisting primarily of affiliate links to products will be deleted.

Earth Science - any of the sciences that deal with the earth or with one or more of its parts.
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Last update: Thursday, April 17, 2014 12:54:11 PM EDT - edit