How Do Whirling Pebbles Drill Holes in River Rock?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. How do whirling pebbles drill holes in river rock?

The Big Idea

Whirling pebbles can drill round holes in hard river rock! The holes are called potholes. They are made by water and stones, not by tools.

Stones Get Trapped

Step one: stones get trapped. In hard rock riverbeds, swirling water can trap small stones in a dip. They cannot easily escape, like marbles in a bowl.

Round and Round

Step two: round and round. The swirling water makes the stones spin around and around. They grind the rock below, like a drill bit.

A Pothole Forms

Step three: a pothole forms. Over years, the grinding drills a round hole, a little deeper each season. Some potholes are as wide as a bathtub, and the rock walls come out smooth and curved.

A Closer Look

Let's take a closer look at a pothole! Swirling water spins in a dip. Stones are trapped inside the hole. They grind the rock below. And slowly, a round pothole forms. Water is a patient artist, and it never needs any tools.

Quick Facts

Quick facts! Potholes can be many feet deep. They are made by water and stones, not by tools. New stones keep the drilling going for years. Stay back from the edge of any rock bank, with a grown-up.

Think Like a Scientist

Now, think like a scientist! Drop a pebble in a shallow pan. Swirl water around it and watch it spin. Imagine that going on for thousands of years. Do this over a tray to catch spills. You just made a tiny pothole machine!

Outro

Water and stones can drill holes in rock. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!