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how does chlorine clean swimming pools

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

if a nucleus were the size of a marble how big would the atom be

If an atom’s nucleus were the size of a marble, the atom would be over 120 metres across. ... read more

the environment in danger

Everything on Earth is connected in some way. Changes on land can affect the air. Changes in the air can affect the water. Damage to one thing always affects something else. It is easy to damage the Earth. Our planet’s population continues to grow. More people means we need to produce more food and ... read more

the solar system

A solar system is a group of planets and one or more stars. Our solar system has just one gigantic star, the Sun. It also has eight planets and three dwarf planets. Many planets have their own moons. There are also thousands of asteroids, meteoroids, and comets. Gravity from our huge Sun holds the sol... read more

molecules

Naturally occurring elements are usually a combination of several elements. Some combine with elements just like themselves. Others combine with different elements. Scientists call these combinations of elements molecules. They are made of at least two atoms and are stable. This means they have the sa... read more