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Book 19, Question 34 · Video

Why Do Some Rivers Look Dark Like Tea?

Video · 1:50 · Crafty Clover explains, from A Million Whys Book 19

Some rivers look dark like tea because of natural stains from leaves and roots! The stains are called tannins. Very dark rivers are known as blackwater rivers.

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What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why do some rivers look dark like tea?

The Big Idea

Some rivers look dark like tea because of natural stains from leaves and roots! The stains are called tannins. Very dark rivers are known as blackwater rivers.

Leaves Fall

Step one: leaves fall. In swampy or forested areas, lots of leaves, roots, and soil are in or near the water. Water slowly flows through all of it, like hot water through a tea bag.

Tannins Leak Out

Step two: tannins leak out. Soaking plant material releases natural brown stains called tannins. The stains tint the water, just like a tea bag.

Life Loves It

Step three: life loves it. Tannins can make water slightly acidic, but many fish and plants love it. The color is natural, even if the water looks dirty.

A Closer Look

Let's take a closer look at dark rivers! It starts in a forest or swamp. Leaves and roots soak in the water. They release tannins. And the river turns the color of tea. The darker the stain, the more tannins, and the more tea-like the river looks.

Quick Facts

Quick facts! Tea gets its color from tannins, too. Very dark rivers are called blackwater rivers. Many fish and plants love tannin-stained water. Never drink river water, even if it looks clear.

Think Like a Scientist

Now, think like a scientist! Put a tea bag in a glass of cool water and watch the color spread. Compare the colors to river photos. Look for one that matches. Do not drink river water. You just made a tannin river!

Outro

Leaves can turn a river the color of tea. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!

Why I wrote this