How do two common external factors, climate and tectonics, shape geologic landscapes? Objective The learner will: • Understand the external forces that aid landscape evolution. • Apply this understanding to the Guadalupe Mountains, Carlsbad Caverns National Park, the Delaware basin area, or your local geography. Background While landscape evolution is dependent upon internal mechanisms to control the ways in which it changes (mineralogy, lithology, fractures, etc.), external driving mechanisms are responsible for causing landscape changes. While there are many geologic responses to external fo Duration: 90 Minutes Additional Standards: The CCSS 6-12 applied are RST item 10 and WHST items 1, 2 and 9. The TEKS applied are in the Subchapter C (High School) for Earth and Space Science (112.36.) item c) 1, 2 and 3..