After oil is formed, continued pressure from overlying rocks causes it to migrate through permeable rock layers until it becomes trapped in reservoirs of porous rocks such as sandstone or limestone.

Revisit the rock cycle. Why does sandstone have the characteristics it does? How are sedimentary rocks formed? Look at areas of the world where sandstone is prevalent. What do the landscapes look ...

The graphic below shows how the movement of the Earth's tectonic plates causes volcanoes to be formed, and what triggers a volcanic eruption.