Discuss the different types of rock (igneous, metamorphic, sedimentary) and the clues students can use to identify an unknown rock (colour, size, scratch test, vinegar test etc.). Set up 3 stations. Station 1 – Observe and draw the rock. Station 2 -Perform a scratch test. Station 3 – Perform a vinegar test. After recording the results students guess which type of rock they have. Wrap up: Confirm which rock each student has, and walk them through the investigation if necessary.
*This activity will require chalk, paperclips, vinegar, and rock samples.
