The document summarizes a bone experiment. Students first touched a bone and found it to be hard and rigid. They then placed the bone in a jar of vinegar. After 7 days, the bone had become soft and flexible. This was because the vinegar had removed the calcium from the bone. Calcium is what makes bones hard, so without it the bone lost its rigidity. The conclusion emphasizes the importance of calcium for strong bones.

1. BoneBone ExperimentExperiment

2. First, we touched the boneFirst, we touched the bone
The bone is hard and rigid.

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

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

5. ThirdThird,, thinkthink andand choosechoose youryour
hypothesishypothesis
What will happen after seven days?
A) Nothing will happen. After seven days, the bone
will be hard and rigid
B) The bone will disappear.
C) The bone will be soft and flexible.

6. ...After 7 days......After 7 days...
The bone is soft and flexible!!!!!

7. 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.

8. 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