Mountains and valleys — Earth science, 4–6 years
Land is not flat everywhere: some parts rise high as mountains, while valleys lie lower between hills or mountains.
High land and low land
A mountain is a very high part of the land, often with steep sides and a top called a peak. A valley is lower land between hills or mountains. If you walk up a mountain and then down into a valley, the ground changes height around you.
Why notice the shape of land?
People need to know whether a route goes up, down or around a steep place. This helps them choose paths, build roads and find water. Naming mountains, hills and valleys gives us a shared way to describe a landscape instead of saying only “over there”.
Following a simple hill
Imagine a walk with three places: the playground, a hilltop and a stream below. First, the path rises from the playground to the hilltop, so the land gets higher. Next, it goes down to the stream, where the land is lower between slopes. The three places show high land, a slope and a valley-like low place.
Every high place is not a mountain
It is reasonable to call every bump a mountain because both hills and mountains rise above the nearby land. Usually, a mountain is much higher or steeper than a hill, but there is no single worldwide number that separates them. The useful first question is simply: is this land higher or lower around it?
Paths, homes and views
Hikers use the shape of the land to prepare for climbs and descents. Engineers study slopes before building a road, railway or house, because steep ground needs careful planning. Mountains and valleys also affect views, travel routes and where streams can collect and flow.
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