Elevation changes refer to the variations in height of the Earth's surface. These changes can occur naturally, such as in mountains, valleys, and hills, or can be influenced by human activities like construction. Elevation is typically measured in feet or meters above sea level, which serves as a baseline for determining how high or low a location is. In geography, elevation changes can impact climate, vegetation, and ecosystems. For example, as elevation increases, temperatures generally decrease, leading to different types of flora and fauna. Understanding elevation changes is essential for activities like hiking, urban planning, and environmental conservation, as they affect accessibility and biodiversity.