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Earth facts for kids

The planet Earth

Earth is our home planet. Find out how much of it is ocean, what its air is made of, why we have days and seasons, and test yourself with a quick quiz.

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Meet Earth

Earth is the third planet from the Sun, about 150 million kilometres away from it. It is the only place we know of where living things are found.

It is the biggest of the four rocky planets, and the fifth biggest planet of all. Earth is the only planet whose English name doesn't come from a Greek or Roman god.

Water and air

Ocean covers about 71 per cent of Earth's surface. The air is about 78 per cent nitrogen and 21 per cent oxygen.

Days, years and seasons

Earth spins round once in about 24 hours. As Earth spins, your side turns towards the Sun for day, then away from it for night.

It travels round the Sun once in about 365 and a quarter days. Most years have 365 days. A leap year adds one extra day to keep calendars in step.

Seasons come from Earth's tilt. Earth is actually closest to the Sun in early January.

One moon

Earth is the only planet in our Solar System with just one moon. Earth is the closest planet to the Sun with a moon of its own.

Earth in a nutshell

Quick quiz: Earth

Try these, then tap Show answer under each one.

  1. About how much of Earth's surface is covered by ocean?

    • About a tenth
    • About a third
    • About seven tenths
    • All of it

    About seven tenths. Ocean covers about 71 per cent of Earth's surface.

  2. Which gas makes up most of Earth's air?

    • Oxygen
    • Nitrogen
    • Carbon dioxide
    • Helium

    Nitrogen. The air is about 78 per cent nitrogen and 21 per cent oxygen.

  3. True or false: We have seasons because Earth gets closer to the Sun in summer.

    False. Seasons come from Earth's tilt. Earth is actually closest to the Sun in early January.

  4. About how far is Earth from the Sun?

    • About 150 thousand kilometres
    • About 150 million kilometres
    • About 150 billion kilometres
    • About 15 kilometres

    About 150 million kilometres.

  5. Where does Earth come in size among the eight planets?

    • The biggest
    • The second biggest
    • The fifth biggest
    • The smallest

    The fifth biggest. It is the biggest of the four rocky planets, and the fifth biggest planet of all.

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