BoneBone Experiment Experiment

First, we touched the boneFirst, we touched the bone

The bone is hard and rigid.

Second, we put the bone in a Second, we put the bone in a glass jar and we covered it glass jar and we covered it with vinager.with vinager.

Scientist always write and Scientist always write and draw their experiments.draw their experiments.

ThirdThird, , thinkthink and and choosechoose your your hypothesishypothesis

What will happen after seven days?A) Nothing will happen. After seven days,

the bone will be hard and rigidB) The bone will disappear.C) The bone will be soft and flexible.

...After 7 days......After 7 days...

The bone is soft and flexible!!!!!

Why?Why?

Bones have calcium. Calcium is what makes our bones hard and rigid.

The vinegar has removed the calcium from the bone.

If the bone has no calcium it becomes soft and flexible.

ConclusionConclusion Calcium is what keeps bones hard and rigid. We must eat calcium to keep our bones hard and rigid. Milk, cheese, yogurt, fish and green vegetables have a

lot of calcium. We must eat them to have strong bones.

If you want to learn more about your bones watch this web page Movie: The Skeletal System