Why Can't You Stand on Coral?

What Crafty Clover says in this video

Intro

Hey there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why can't you stand on coral?

The Big Idea

Coral looks like a rock, but it is alive! It is a thin layer of living animals called polyps growing on a skeleton they built. One step can crush years of slow growth in a single second.

A Foot Lands

Step one: a foot lands. A fin or a shoe presses down on the reef. To the tiny animals that live there, it is like a wrecking ball.

Tissue Tears

Step two: the living tissue tears. The thin, soft layer on the outside gets scraped and crushed. Cuts like these can also let germs in.

Branch Snaps

Step three: the branch snaps. Many corals are fragile and break easily. A broken branch may die, and it leaves a hole in the reef city.

A Closer Look

Let's take a closer look inside a coral branch! The outside is the colorful living tissue. Inside is the hard skeleton, made of limestone. And this is a broken branch, with a jagged edge where the coral was hurt. Remember, the rock-like part is covered by living animals!

Quick Facts

Quick facts! Some corals grow only about as fast as a fingernail. Even bumping the reef with a camera counts as touching it. Polyps are usually only a few millimeters wide, smaller than a pea. Look with your eyes, not your hands.

Think Like a Scientist

Now, think like a scientist! Let's think about slow growth. Why does slow growth make one step so costly? What is the rock-like reef covered with? If you ever visit a reef, float, keep your fins up, and let a grown-up pick the swim spot. Draw a picture of a kind reef visitor.

Outro

If it is living reef, it is not a sidewalk. Science is amazing! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!