Why Does Ice Grow Out From the Riverbank First?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why does ice grow out from the riverbank first?

The Big Idea

Ice grows out from the riverbank first because the edges are slow, shallow, and cold! The fast, deep middle keeps flowing, so it stays open longer. Thin shelves of ice reach out from each side toward the center.

Slow and Shallow

Step one: the edges are calm. Near the banks, the water is slow, shallow, and chilled by the cold ground. That makes it the easiest place for ice to start.

Shelves Reach Out

Step two: shelves form. Ice forms as thin shelves reaching out toward the middle. Ice at the edge is called shore ice. The fast, deep center keeps flowing, so it stays open longer.

Meeting in the Middle

Step three: the shelves meet. Sometimes the shelf ice grows until it meets in the middle and covers the whole river. Even then, the ice can be thin in places, so it is never safe to walk on.

A Closer Look

Let's take a closer look! The bank stays cold in winter. Shore ice forms in the slow water beside it. The fast center stays open for a while. And the shelves can grow until they meet.

Quick Facts

Quick facts! Ice at the edge of a river is called shore ice. The edges freeze first because they are shallow and slow. The flowing center needs more cold to freeze. Watch frozen rivers from far back with a grown-up.

Think Like a Scientist

Now, think like a scientist! Put a shallow dish of water in the freezer with a grown-up's help. Check it after a while and see where the ice starts. Look at the edges first. Then tell a grown-up what you saw!

Outro

Rivers freeze from the edges inward. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!