Bones (6th Grade)

Hello children!

Some days ago, pupils were asked to bring bones in class. Attention! These bones had to be cooked, cleaned and frozen, for our safety work.

Once we had all the bones (most of them, chicken bones), we classified them into 3 groups:

LONG - SHORT - FLAT

After that, we broke a bone to see what it has inside: THE BONE MARROW; responsible for making blood cells.

Then, we put some bones in a jar full of white vinegar, and we waited for 2 weeks.

What happened to the bones when we opened the jars after 2 weeks?

We found out that bones could be easily bended! But, why?

Vinegar is an acid, so it dissolves away the calcium in the bones. When the calcium is dissolved, the bone isn't hard.

This is the reason why it is so important to eat calcium (milk, yogurt, cheese,...). The calcium we eat, goes to our bones and makes them stronger.