Rock detectives

We have been rock detectives in team 5 today!

First, we learnt about the 3 different types of rock and how they are made: igneous, sedimentary and metamorphic.

Then, we did some different experiments on rocks and recorded our observations. These observations told us more information about what type of rock each one was.

First, we put limestone, sandstone, slate, marble, granite and chalk in vinegar (acid). We observed whether the rocks fizzed or not. Sedimentary rocks are more likely to fizz because they are made up of little bits of sediment. Metamorphic rocks can sometimes fizz if they started out as sedimentary rocks.

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Chalk fizzed the most and this shows us that it is a sedimentary rock. Limestone  and sandstone fizzed a little bit.

Then, we investigated the hardness of the rocks. We made sure it was a fair test by scratching each rock the same number of times with the same material.

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Miss Marsden 😊

 

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