Fossil fuels are considered to be _____________________.  

A common igneous rock that is felsic, intrusive, and predominantly white, pink, and gray in color is _______

Earth sciences must consider both _________ and __________. 

This region is thin, approximately 7 kilometers in depth and is composed of primarily dense basaltic rock.  

All matter, including minerals, is composed of _______.  

__________ refers to how a light reflects from the surface of a mineral.  

Which of the following is NOT a criterion of minerals?  

The four spheres of Earth are 

_____________ studies the materials and processes that compose and shape the Earth.  

The __________________ is equivalent to the number of protons and the number of electrons in an atom.