Crossword Puzzle Unit 3 Vocabulary Part AOnline version Vocabulary words for Central and South America by Callye Comeaux 1 The changes humans make to their environment and how humans adapt to it 2 refers to a natural resource that cannot be replenished naturally 3 The characteristics of a natural setting for human activity 4 the study of physical features of the earth's surface 5 refers to a natural resource that can be replenished naturally 6 materials or substances such as minerals, forests, and water 7 clearing forests to use the area for other purposes 8 coal, oil, natural gas, and other fuels that are ancient remains of plants and animals 9 study of human population 2 5 3 4 6 7 9 8 1