Out of the following given choices;
A rapid cooling of the molten rock
B high density of the molten rock
C numerous faults in the island’s bedrock
D high pressure under the island
The answer is; A
When the magma rises from the mantle onto the earth surface in the region, it encounters ice-cold temperatures that cool the magma rapidly. This reduces the time that large mineral crystals (typical of slow-cooling) can form in the cooling rock hence the typical characteristic of these rocks are fine-grained and brittle.
