Earth & Space
How do mountains form?
A folded cloth inspires a very big question.
The short answer
Many mountain ranges form when Earth's plates move together. Rock folds, breaks and rises. Other mountains form through volcanoes. Water, wind and ice continue changing their shape.
An imagined Wusel scene
Puschel and Flauschi investigate
Puschel pushes the ends of a soft cloth together on a level surface. A fold rises in the middle.
Puschel“A cloth mountain!” Flauschi“It reminds us of folds. But Earth is not made of cloth.”
Flauschi“Tectonic plates are huge sections of Earth’s hard outer layer. When they move towards each other, layers can fold and rise. This takes a very long time.”
Puschel looks at distant hills. Puschel“So a mountain did not simply grow overnight.”
Flauschi“And water can carry material away again.” They smooth the cloth. Puschel“Our little cloth mountain models an idea, not the whole explanation.”
Little Wusel quiz
Is every mountain a volcano?
Choose one answer: a), b).
- a)No
- b)Yes
Show answer
Correct answer: a): No No. Many ranges form through movements and collisions of tectonic plates.
What is missing if we describe mountains only as growing shapes?
Show answer
They are also weathered and eroded. Water can transport material away.
Word help
- erosion
- Water, wind or ice wear away and remove soil or rock.
Explore in more detail
Here you will find longer explanations and further details. You can explore them together.
Understand step by step
How it works – simply explained
Plates move slowly
Earth’s rigid outer layer is divided into large plates. Some move towards each other, far more slowly than a short walk.
Rock deforms and rises
Collisions can fold, break and lift layers. Mountains develop over very long periods. Others build from volcanic material.
Wearing away also matters
Water, ice and other influences keep changing rock. Material carried away is erosion. Mountains do not only grow in one direction.
Why a mountain does not appear overnight
Plate movements folding and lifting rock usually act over very long periods. Imagine countless small changes over millions of years. A short explanation brings together this long development. Water and ice also remove material, so today’s mountain shape reflects several processes.
The key points again
Discovery 1
Earth’s hard outer layer is made of huge sections called tectonic plates. Many mountain ranges form when these plates move towards one another. Rock layers can fold, break and rise. Such ranges develop over very long periods, often millions of years.
Source: [1]
Discovery 2
Not every mountain forms the same way. Volcanoes can also build mountains as erupted material accumulates. A mountain is therefore not automatically a volcano.
Source: [2]
Discovery 3
Mountains keep changing. Weathering means that rock changes over time and can break into smaller pieces. Erosion means that material is removed and carried away. For example, flowing water can carry rock material away from a mountain range.
Source: [1]