Oxygen, a nonmetallic chemical element that is contained in air and water, in the earth's crust, and in all forms of life.
WHAT'S INSIDE: PHYSICAL SCIENCE
Physical science is the study of the physical world around you. Learn about everything from electricity to magnetism in this section.
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History of Physical Science
The history of physical science explains how some of the major physics concepts were discovered. Check out these articles on the history of physics.
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