Video Activity 5 Spot that rock - weak or strong?

Video question script Spot that rock

ELI activities Rock detective - rocky clues to the past; investigating your local rocks to find out how they formed
Rock, rattle and roll; investigating the resistance of rocks to erosion by shaking in a plastic container

Video 1   - Rock clues
Video 2   - Grain clues
Video 3   - Predicting properties
Video 4a - Rocky modelling: 2D model
Video 4b - Rocky modelling: adding water
Video 4c - Rocky modelling: options
Video 4d - Rocky modelling: tipping container/rock
Video 6   - Rock sort 1: two great groups
Video 7   - Rock sort 2: striped rock
Video 8   - Rock sort 3: all rocks
Video 9   - Sedimentary to metamorphic
Video 10 - Naming rocks