Earth as a Planet — Flashcards
ICSE · Class 9 · Geography
32 flashcards for Earth as a Planet (ICSE Class 9 Geography) to test yourself on key terms and facts. Sample: "Why is Earth called a unique planet?"
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Why is Earth called a unique planet?
Answer
Earth is unique because it is the only planet known to harbour life. Its distance from the Sun, its atmosphere, and its water cycle make life possible.
What does the word planet mean?
Answer
The word planet comes from a Greek word meaning wanderer. Planets are called wanderers because they revolve round the Sun.
Name the eight planets in order from the Sun.
Answer
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
Which planet is closest to the Sun, and which is the hottest planet?
Answer
Mercury is closest to the Sun, but Venus is the hottest planet. Venus is hottest because its thick carbon dioxide atmosphere traps heat.
What is Earth's position among the planets?
Answer
Earth is the third planet from the Sun, the densest planet in the solar system, and the fifth largest planet overall.
What are terrestrial planets? Give examples.
Answer
Terrestrial planets are rocky planets. Mercury, Venus, Earth and Mars are terrestrial planets.
What is the shape of the Earth?
Answer
Earth is shaped like an oblate spheroid. It is slightly flattened at the poles and bulges at the Equator. The word geoid also means earth-shaped.
Why was Earth's roundness accepted beyond doubt after Magellan's expedition?
Answer
Ferdinand Magellan's round-the-world expedition in 1519 proved that Earth is round in shape because the journey returned to the starting point.
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