What are habitat islands and how do they occur?

They are patches of suitable habitat type surrounded by large areas of unsuitable habitat.

Explanation:

When humans clear an area for development, they remove, alter, or destroy the resources organisms need to survive.

Hope that this helps you and have a great day :)

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.