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New TOEFL IBT Pratice Test #002

New TOEFL IBT Pratice Test #002

Listening | Question 14 of 16

Listen to an Academic Talk

According to the professor, what prevents the superheated water from boiling initially?
A) The lack of oxygen underground
B) The depth of the water source
C) The pressure from the water above it
D) The specific mineral content of the rocks