Why Are River Valleys Shaped Like a V in the Mountains but Wide Near the Sea?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why are river valleys shaped like a V in the mountains but wide near the sea?

The Big Idea

High in the hills, a river valley looks like the letter V! Near the sea it is wide and flat. The shape depends on whether the river is cutting down or swinging sideways.

Cutting Down

Step one: cutting down. High in the hills, a fast stream cuts downward into rock and soil. That makes a narrow valley shaped like a V.

Swinging Sideways

Step two: swinging sideways. Farther down, the land is flatter, so the river swings from side to side. It wears away its banks and makes the valley wider.

Flat Floor

Step three: a flat floor. Over time the river builds a broad valley with a flat floor. That flat land on each side is called a floodplain.

A Closer Look

Let's take a closer look at valley shapes! Near the mountains, the slope is steep. A steep stream cuts down, like a saw. A lazy river cuts sideways, again and again. And the wide, flat valley floor is a floodplain. Steep stream, V shape. Lazy river, wide valley.

Quick Facts

Quick facts! A steep stream cuts down; a lazy river cuts sideways. The flat floor of a wide valley is called a floodplain. Floodplains have rich soil that is good for farming. Stay with a grown-up near any river.

Think Like a Scientist

Now, think like a scientist! Draw two cross-sections of a valley, one narrow V and one wide U. Label which one is near the mountains. Label which one is near the sea. Add a little river at the bottom of each. You just drew how rivers shape the land!

Outro

A steep stream cuts down, and a lazy river cuts sideways. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!