Above 100,000 feet altitude (20 miles).
The highest mountain in the Alps is Mont Blanc, at 4,810.45 metres (15,782 ft).
The Alps were formed through the collision of the African and European tectonic plates, which began about 30 million years ago. This collision caused the Earth's crust to fold and push upwards, creating the mountain range that we know as the Alps. Continued tectonic activity and erosion have shaped the Alps into the majestic mountains they are today.
The higher the altitude the lower the temperature.
The highest mountain in the Alps is Mont Blanc, at 4,808 metres (15,774 ft), on the Italian-French border.
12,000 ft is the treeline in Colorado.
As we watched, the deer slowly walked out from the treeline.
The Alps range from 2007 meters above sea level to 4808 meters above sea level.
High altitude vegetation is typically called "alpine", from the plants that grow high up in the Alps mountain range.
Small branch plants grow above the treeline.
Downhill from the treeline, it is warm enough for trees to grow. Uphill from the line, it is too cold.
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Timer line
Ötzi, also known as the Iceman, was found in the Ötztal Alps on the border between Italy and Austria, at an altitude of around 3,210 meters (10,530 feet). While not at the very peak of the mountain, he was discovered in a isolated and high-altitude location.
Modern passenger jets have a normal cruising altitude of 30,000 feet/9000 meters - much higher than the tallest mountains in the world. They have no problem flying over the Alps or any other mountain range.
9,000-12000 feet. California is a big state, obviously. Treeline drops by 1000 feet for every 600 miles north you travel, on average. Additionally, treeline is about 1500 feet lower on the west side of the Sierras than on the east side, due to the cooler summers caused by the nearby ocean.
All mountains have trees, but only for so high. There is the treeline which, on a mountain, is the altitude line above which no trees will grow. Some species of trees (conifers, for example) may grow higher than broadleaf trees that thrive best lower down in the valleys.