Climate Change · Botany

How does 'Thermal Expansion' contribute to sea-level rise?

  1. Water molecules expand as they freeze into icebergs.
  2. The addition of salt to the ocean increases its total volume.
  3. Increased evaporation leads to denser, heavier ocean water.
  4. Warmer water molecules occupy more space as they heat up.
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Correct answer: Warmer water molecules occupy more space as they heat up.

As the oceans absorb about 90% of the excess heat from global warming, the water physically expands. This thermal expansion, along with the melting of land-based glaciers, is a primary driver of rising sea levels.

Difficulty: Medium Question 11 of 20

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