What Happens Where a River Meets the Sea?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. What happens where a river meets the sea?

The Big Idea

The place where a river meets the sea is called an estuary! Fresh river water mixes with salty seawater. The mixed water is called brackish, which means a little bit salty.

Fresh Meets Salt

Step one: fresh meets salty. River water has very little salt, and seawater has a lot. Where they mix, the water is brackish.

Tides Change It

Step two: the tides change things. When the tide comes in, salty water pushes up the estuary. When it goes out, fresh water flows toward the sea, so the mix is always changing.

Nursery for Life

Step three: a nursery. Many young fish find food and shelter in estuaries. Birds visit to feed in the shallow water.

A Closer Look

Let's take a closer look at an estuary! Fresh water comes down the river. Salty water comes in from the sea. The tides push and pull the mix. And young fish and birds love the shelter. The St. Lawrence Estuary in Canada is one of the biggest in the world.

Quick Facts

Quick facts! Estuaries are some of the most productive habitats on Earth. Brackish water is a bit salty, but not as salty as the sea. The mix changes with the tides. Watch estuaries from the shore with a grown-up.

Think Like a Scientist

Now, think like a scientist! Stir plenty of salt and a drop of blue food coloring into a small glass of water. Gently pour plain water over the back of a spoon on top. Watch the two layers. Do not taste either one! Salty water is heavier, so it stays on the bottom. You just made an estuary in a glass!

Outro

Where rivers meet the sea, fresh water and salt water mix. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!