Multiple choice

Consider the following statements in relation to Earth’s topmost layer:

  1. Transverse earthquake waves move at a speed of 3.5 km/s in that layer.
  2. The specific gravity is 2.7.
  3. It is shallowest under continents and deepest under oceans.
  4. Abundance of magnesium.

Which of the above statements are correct?

  1. 1 and 2 only

  2. 2 and 3 only

  3. 3 and 4 only

  4. 1, 2 and 4 only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Earth's topmost layer (crust) has a specific gravity of about 2.7 and transverse earthquake waves (S-waves) travel through it at approximately 3.5 km/s. It is thickest under continents and thinnest under oceans, making statement 3 incorrect.

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