Saturday, December 31, 2022

How The Chocolate Hills in Bohol Was Formed?


(based on the Chocolate Hills Monument)

The unique landform known as the Chocolate Hills of Bohol was formed ages ago by the uplift of coral deposits and the action of rainwater and erosion.

These hills are scattered throughout the towns of Carmen, Batuan, and Sagbayan, and consist of 1268 mounds of the same general shape.

About two million years ago, most of the island of Bohol was below shall sea coral reefs, similar to those now found offshore of Northern Bohol, thrived and extensively covered the sea floor.

During the stormy days, fragments of corals and shells derived by waves from the reefs were deposited mostly at the landward side of the reefs.

The coral and shell fragments formed relatively thin layers (brown) surrounding the live coral reefs (pink).

Slowly, the land rose causing the coral reef formations to emerge out of the sea. The southern sections of Bohol island had been uplifted more than the northern sections.

The Chocolate hills had been carved out from the relatively thin layers of coral and shell fragments.
During the initial stage, the surface may have looked like as gullies, these were developed in the low lying areas and lakes occupied pre-existing depressions.

Coral and shell fragments are largely composed of calcium carbonate. A chemical compound which can be dissolved by acidic solution.

Rainwater becomes slightly acidic by dissolving some carbon dioxide form the atmosphere. Thus, rainwater can dissolve coral and shell fragments but this happens very slowly.

With rainwater acting on the layer of coral and shell fragments for tens to hundreds of thousands of years, gullies were deepened and widened to become streams, lakes were emptied by underground rivers and interconnected conical hills were formed from the original flat surface.

The Stairs Going To The Landing Area Where The Scenic View of the Chocolate Hills of Bohol Can Be Seen in a 360 Degree Angle

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thanks for dropping by, what are your thoughts about The Chocolate Hills of Bohol Philippines

-- bmvd