Which geographic feature best describes the Atacama Desert Mountains?

• A. Coastal rainforest
• B. Tundra
• C. Mountainous desert region
• D. Dense forest

Answer: (C)

The main idea is how climate and terrain combine to shape a landscape. The Atacama Desert Mountains describe a desert that sits within rugged, high-elevation terrain. The mountains and coastal ranges act as barriers that block moist air from reaching the area, creating a rain shadow effect and yielding extremely dry conditions. That blend—desert climate with mountainous terrain—fits the description of a mountainous desert region. It isn’t a coastal rainforest or dense forest, which require more moisture, and it isn’t tundra, which is defined by cold temperatures and permafrost rather than the arid conditions here.