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How it works

how does chlorine clean swimming pools

The chemical reaction that stops swimmers from getting sick. ... read more

why does it hurt so much when you step on a plug

Balancing your body weight on the pins of a plug puts huge pressure on your foot. ... read more

compounds, acids and bases, mixtures, and solutions

Every material is made of either a pure substance or a combination of substances. A substance is pure if it contains only one type of element. An element is a substance made up of all of the same type of atoms. Oxygen is a pure substance. It only contains oxygen atoms. Elements combine in several ways... read more

people who study the earth

Throughout history, people have always wanted to understand the planet we live on. They wanted to know why the weather changes from hot to cold and back again. They wanted to know why it rains or snows and what lightning and thunder are. They wanted to know why volcanos erupt and why earthquakes move ... read more

reactions

Chemical Reactions ... read more