Multiple choice general knowledge science & technology

Tectonic plates float on the...

  1. Atmosphere

  2. Hydrosphere

  3. Asthenosphere

  4. None of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Tectonic plates float on the asthenosphere, which is the mechanically weak, ductile layer of the upper mantle. The asthenosphere is partially molten and allows the rigid lithospheric plates to move. The atmosphere is the layer of gases above Earth's surface. The hydrosphere refers to all water on Earth's surface. The asthenosphere's plasticity enables plate movement through convection currents in the mantle.

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