What we will need?
Pebbles/rocks and safety goggles.
What we will do
Find a big boulder and get some rocks and start scraping the rock on the boulder.
We will comepere the rocks to see which rock was scratched the most.
Credits:
Created with images by stebulus - "rocks" • D-Stanley - "Rock of Gibraltar" • skeeze - "delicate arch sunset rock" • tpsdave - "turkey sunset dusk" • Baron Von Horrible - "Rock Texture" • stebulus - "rocks"