How to explain a mountain to a child

A mountain is a very big, high hill that sticks up into the sky. It has steep sides that are hard to walk up and a top called a peak. Some mountains are rocky, some are covered with trees, and some have snow on top. Mountains are one kind of landform, or shape of the land.

Examples of mountains for different ages

Example 1 (younger learners): Imagine standing in a wide, flat valley with grass all around. In front of you is a huge, steep rise of land that is much taller than any hill nearby and has a pointed top. That tall, steep landform is a mountain, because it rises high above the land around it and has steep sides.

Example 2 (older learners): The Himalayas in Asia and the Rocky Mountains in North America are large mountain ranges, or long chains of mountains that are connected. Many of these mountains formed where pieces of Earth’s crust, called tectonic plates, slowly pushed into each other over millions of years. The plates crumpled and lifted the rock upward, creating tall, steep mountains that continue to change over time through weathering and erosion.

Going deeper: how mountains form and change

Many mountains form where tectonic plates meet. When plates collide, one plate can be pushed up or crumpled, lifting rock into tall ridges and peaks. This process is part of what scientists study in plate tectonics.

Other mountains form from volcanoes, when melted rock from inside Earth erupts and piles up on the surface. Over long periods of time, weathering (breaking down of rock) and erosion (moving broken rock and sediment) slowly wear mountains down, changing their shape and height.

Mountains are one type of landform, along with valleys, plains, and plateaus. They are also part of the rock cycle, because the rocks that make up mountains can be melted, squeezed, broken, and changed into new types of rock over geologic time.

Common mistakes about mountains

  • Mistake: Thinking any small hill is a mountain.
    Correction: A mountain is usually much taller and steeper than the land around it; gentle, low rises in the land are hills, not mountains.
  • Mistake: Believing all mountains are volcanic and can erupt.
    Correction: Some mountains are volcanoes, but many mountains form when Earth’s crust is pushed and folded, and those mountains do not erupt.
  • Mistake: Assuming mountains never change because they are made of solid rock.
    Correction: Mountains slowly change shape and height over time through weathering and erosion, even though this change is too slow to see day to day.

Where mountains show up in everyday life

Your child might see mountains on a family trip, in photos, in movies, or in books about nature and animals. Weather reports sometimes mention mountain conditions, such as snow in the mountains. Many sports, like skiing and hiking, take place on or near mountains, and some cities are built in valleys between mountain ranges.

Related earth science terms

To explore connected ideas, you can also look at:

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