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What is the approximate thickness of the Earth's crust under continents?
- 5-10 km
- 20-30 km
- 30-50 km
- 70-100 km
Answer: 30-50 km
The continental crust is approximately 30-50 km thick, while oceanic crust is thinner (5-10 km). The crust is the outermost solid shell of Earth, composed mainly of granitic rocks on continents and basaltic rocks under oceans.