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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

weather

We talk about the weather every day, but what exactly is it? We can define it as the state of the atmosphere. The amount of wind, the temperature, the moisture, and cloudiness are some of the things that make up weather. ... read more

what is earth science

As far as we know, Earth is the only place in the solar system that contains all the ingredients (liquid water, chemical building blocks, and an energy source) needed for life. All the living things we know of live on Earth. It is home to plants, animals, and humans. Everything on the planet needs eve... read more

why don’t grains of salt stick together

Common table salt doesn’t clump thanks to the addition of anti-caking agents. ... 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