STEM Challenge Week 7

Time for week 7 of our STEM at Home Challenges. Visit our blog every Thursday to see our latest STEM challenge and share your creations on Facebook using #CMMSSTEMChallenge or by emailing marketing@childrensmanor.com.

Your Goal:

Use your science investigative skills to explore rock hardness in various types of rocks using rocks found in your backyard or around the neighborhood. Your first step is to get outside and collect some rocks that you can use to test! Make sure to share your photos with us by Monday, May 18, 2020.

Materials:
    • Collection of Rocks (at least 4 different rocks, but more is better!)
    • Black and White Construction Paper (or any other light and dark colored paper)
    • Nail or paper clip
    • Magnifying Glass (optional)
Process: 

Rock Investigation #1

We are trying to identify two categories: rocks that leave a colored mark on paper and rocks that do not.

Investigation #1 Instructions:

    1. Make a label for each category so you can sort your rocks once you complete your investigation.
    2. Take each rock and “draw” on your paper to see if any dust is removed. Having both black and white paper will allow you to see the lighter and darker dust from the rocks.

Rock Investigation #2

We are trying to identify two categories: rocks that can be marked by a nail and rocks that cannot be marked by a nail. (Note: Adult supervision required for this test).

Investigation #2 Instructions:

    1. Make a label for each category so you can sort your rocks once you complete your investigation.
    2. Take each rock and attempt to make a mark on the rock with a nail or paper clip. You will notice one of two things: a) the rock will scratch, leaving a line, a crack or dust OR b) the nail will rub off on the rock leaving a silver mark on the rock If you see a scratch, a line, or dust, this means that your NAIL is HARDER than your ROCK. If you see a silver line on your rock, this means that your ROCK is HARDER than your NAIL.
Questions to think about:

Why did some rocks leave marks on the paper and others did not? Why is there a difference in the hardness of the rocks? Does it have to do with where they were found?

Results:

Send a photo of you and your rock collection to marketing@childrensmanor.com. Please let us know if you were able to find any rocks that were harder than your nail. If you would also like to take a video of you explaining your findings, please share that on your Seesaw Class Journal for your classmates to see!

Activity Idea: Lemon Lime Adventures