Why Would the Gravity Anomaly Over a Deep-Ocean Trench Be

question 5

Multiple Choice

Why would the gravity anomaly over a deep-ocean trench be negative?

• A) because the bathymetry of the trench dips very far below sea level
• B) because the crust being pulled into the trench is less dense than sediments above
• C) because water fills the space above the subducting slab and is much less dense than rock
• D) because the buoyant magma created at the subduction zones is less dense than the rock

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