Which sentence most likely explains why the rock has large open pores?

A. Softer parts of the rock melted in sunlight, leaving behind empty holes.

B. Contact with hard pebbles during cooling left dents in the rock.

C. Bubbles formed in the magma when it was still in liquid form.

D. Crystals embedded in the rock fell off due to friction in Earth’s crust.

Bubbles formed in the magma when it was still in liquid form.

Explanation:

Bubbles occur especially in thick magma that contains high silica content. Magma has low viscosity and it has the ability to cool down fast when exposed to the atmosphere, due to magma high viscosity nature, it has the ability to capture its gases into bubbles.

Especially when magma has high gaseous content such as SO2 it can capture its gases into bubbles, and when the magma cools down into a rock, the gasses getaway leaving behind bubbles or pores in the rock. Magma is defined as a semi-molten or molten rock mixture. Pumice rock is an example of it.

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