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Astronomy & space · Grades 3–8

Rocky planets and giant planets

Study guide for Grades 3 to 8: 2 worked examples and 2 practice questions. The four inner planets (Mercury, Venus, Earth, Mars) are rocky.

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Rule and key idea

The four inner planets (Mercury, Venus, Earth, Mars) are rocky. The four outer planets (Jupiter, Saturn, Uranus, Neptune) are giants made mostly of gases and ices.

inner 4 = rocky · outer 4 = giants

Worked examples

Which is a giant planet: Uranus or Mercury?

The four inner planets (Mercury, Venus, Earth, Mars) are rocky. The four outer planets (Jupiter, Saturn, Uranus, Neptune) are giants made mostly of gases and ices.

Uranus

Which is a giant planet: Mars or Neptune?

The four inner planets (Mercury, Venus, Earth, Mars) are rocky. The four outer planets (Jupiter, Saturn, Uranus, Neptune) are giants made mostly of gases and ices.

Neptune

Try two questions

  1. Which is a rocky (terrestrial) planet: Venus or Jupiter?

    1. Jupiter
    2. Venus

  2. Which is a giant planet: Venus or Neptune?

    1. Venus
    2. Neptune

Answers and reasoning

Answers and marking notes
  1. Venus

    The four inner planets (Mercury, Venus, Earth, Mars) are rocky. The four outer planets (Jupiter, Saturn, Uranus, Neptune) are giants made mostly of gases and ices.

  2. Neptune

    The four inner planets (Mercury, Venus, Earth, Mars) are rocky. The four outer planets (Jupiter, Saturn, Uranus, Neptune) are giants made mostly of gases and ices.

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