Fold Mountains Mountains formed when two Plates Collide.
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Transcript of Fold Mountains Mountains formed when two Plates Collide.
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Fold MountainsFold Mountains
Mountains formed when two Mountains formed when two Plates Collide.Plates Collide.
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Fold MountainsFold Mountains
• Fold mountains are mountains that are made when two of the earth’s plates collide.
• When two plates collide the pressure compresses the rocks, forcing them to buckle and fold. Think of what happens to the bonnet of a car during a crash.
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Fold MountainsFold Mountains
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Fold MountainsFold Mountains
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Evidence of FoldingEvidence of Folding
• Scientists have found fossils of dead sea creatures thousands of metres up in the Andes in South America.
• These creatures lived in the sea, and their remains sank to the ocean floor when they died.
• Their remains were trapped in newly forming rocks which are later pushed up from under the sea when plates collide to make fold mountains.
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Ridge and Valley LandscapeRidge and Valley Landscape
• When the two plates collide the crust buckles and folds. This creates a pattern of ridges and valleys.
• The downward part (the valley) is called a syncline.
• The upward part (the ridge) is called an anticline.
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Young Fold MountainsYoung Fold Mountains
• As we know from previous sections, the earth’s plates are constantly colliding in different parts of the world. These collisions are still increasing the height of some fold mountains today.
• The world’s young fold mountains are already about 30-35 million years old.
• These mountains are called Alpine Fold Mountains. They are very high because they have not been worn down by weathering and erosion.
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Alpine Fold MountainsAlpine Fold Mountains
• There are 4 major mountain ranges formed during the Alpine Folding period. These are,
• 1. The Rockies in North America.
• 2. The Andes in South America.
• 3. The Alps in Europe.
• 4. The Himalayas in Asia.
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Where are Fold Mountains Made?Where are Fold Mountains Made?
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Fold MountainsFold Mountains
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Alpine Fold MountainsAlpine Fold Mountains
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Alpine Fold MountainsAlpine Fold Mountains
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Alpine Fold MountainsAlpine Fold Mountains
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Alpine Fold MountainsAlpine Fold Mountains
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Which 2 plates collided to form the Andes?Which 2 plates collided to form the Andes?
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The HimalayasThe Himalayas
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The HimalayasThe Himalayas
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The HimalayasThe Himalayas
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Which 2 plates collided to make the Himalayas?Which 2 plates collided to make the Himalayas?
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Armorican Fold MountainsArmorican Fold Mountains• Ireland’s fold mountains were formed hundreds of
millions of years ago.
• They were formed in Munster about 250 million years ago, and were once as high as the Alps.
• However, weathering and erosion have worn them down over millions of years and they are now much smaller.
• Examples include the Magillicuddy’s Reeks, The Galtees, The Comeraghs, and The Knockmealdowns.
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Armorican Fold MountainsArmorican Fold Mountains
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