This document discusses the frequency of occurrence of different types of resources, including ubiquitous resources that can be accessed without limits, such as wind and solar energy; common resources that are widely but unevenly distributed, like forests and water; rare resources found in small amounts, including valuable minerals like iron, copper, and gold; and unique resources only located in certain areas but economically important, such as uranium, thorium, and radium. Examples are provided for each category of frequency of occurrence for natural resources.