Which of the following is an example of an igneous rock?

Which type of rock is formed by the cooling of molten magma?

Marble is formed from which rock?

Which mineral is used to make ordinary glass?

Which of the following is a metamorphic rock?

Coal is an example of which type of rock?

Which mineral is the main source of aluminum?

Which mineral is used in making pencils?

Which type of rock forms under great heat and pressure?

The outer layer of the Earth is mostly made up of which type of rock?