Multiple choice

What are the two sources of energy for the Earth system?

  1. lightning and the sun

  2. the sun and Earth's interior

  3. the sun and wind

  4. Earth's interior and the winds
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Earth system is powered by two main sources: the sun (external energy for surface processes) and Earth's interior (internal energy for geological processes).

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