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What would you build a castle from?

 We carried out a science investigation to find out what material we should build a castle from. We looked at lots of different rocks and did sketches of each one. We then decided to test how hard each rock was by carrying out a scratch test. We found that coal and sandstone were really soft so we decided they wouldn't be good to build from. Most of us thought that granite would be the best building material because it was the hardest.