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While researching a topic, a student has taken the following notes:
- The Peloncillo-Pan Duro Mountains are located in northwestern Mexico.
- They cover an area of 1,360 square miles ().
- The Big Hatchet Mountains are located in the southwestern United States.
- They cover an area of 65 .
- These mountain ranges are two of the dozens of "sky islands" in the southwestern US and northwestern Mexico.
- A sky island is an isolated mountain range whose environment differs drastically from that of the surrounding lowlands.
- The Peloncillo-Pan Duro Mountains are located in northwestern Mexico.
- They cover an area of 1,360 square miles ().
- The Big Hatchet Mountains are located in the southwestern United States.
- They cover an area of 65 .
- These mountain ranges are two of the dozens of "sky islands" in the southwestern US and northwestern Mexico.
- A sky island is an isolated mountain range whose environment differs drastically from that of the surrounding lowlands.