1. The document defines resources as all useful elements of the environment that satisfy human needs, including soil, rocks, minerals, trees, land, wood, and water. 2. Resources are classified as natural, human, or man-made, and can be actual or potential, abiotic or biotic, renewable or non-renewable, ubiquitous or localized. 3. Natural resources occur naturally and include materials like fresh water, air, plants, and animals. Human and man-made resources are things created by human beings, like buildings, bridges, skills, knowledge, and infrastructure.