Here's why it's so difficult to define:
* Varying definitions: What qualifies as a mountain? A hill? A plateau? Different cultures and scientific disciplines have different standards.
* Elevation differences: There's no single elevation threshold that separates mountains from hills or plains. Some people use 1,000 feet (305 meters) as a cutoff, others use 2,000 feet (610 meters).
* Varying topography: The Earth's surface is incredibly diverse. Mountain ranges are surrounded by valleys, plateaus, and plains.
However, we can make some general observations:
* Significant coverage: Mountains definitely make up a significant portion of the Earth's surface.
* Global distribution: They are found on every continent, with major ranges like the Himalayas, Andes, Rockies, and Alps.
Instead of a single percentage, it's more useful to understand the distribution of different elevations:
* About 24% of the Earth's landmass is above 600 meters (1,969 feet). This includes mountains, plateaus, and highlands.
* A smaller percentage of the Earth's surface is above 1,500 meters (4,921 feet). This is closer to what we might consider "true" mountainous terrain.
Therefore, while we can't give a precise percentage, it's clear that mountains represent a significant and diverse portion of our planet.
