What unique geological feature allows the Pasig River to experience reverse flow, moving water backward from Manila Bay into Laguna de Bay?
Answer and explanation
Correct answer: D. high marine tidal levels during the dry season exceeding the water level of the lake
- Step 1: The Pasig River is technically a tidal estuary, as the flow direction depends upon the water level difference between Manila Bay and Laguna de Bay. Answer: high marine tidal levels during the dry season exceeding the water level of the lake. Why not the others: None of these fit: Massive seasonal underground oceanic springs erupting at the mouth of the river; Heavy torrential rainstorms concentrated exclusively over the Zambales mountains; Artificial deep navigation dredging creating a downward oceanic elevation gradient.
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