In year 3, we have been looking at different rocks. This week we focused on two sedimentary rocks: chalk and limestone. We found that these rocks both contain calcium carbonate and they are relatively soft rocks. 

At St George's, our curriculum vision statement for Science is:

Be academic. 

Be curious. 

Be practical. 

In this lesson we were both academic and practical, getting hands-on with rocks and then classifying them like scientists.

We had a range of different rocks and had to decide whether they were limestone or chalk. We used a small drop of vinegar and lemon juice to see if the rock would react. If the rock created a fizz or frothing, carbon dioxide was present, meaning the sample would be either chalk or limestone.

Check out the photos below to see how we got on. 

Testing the rocks

Classifying