What's the difference between porosity and permeability?

Our new ELI just published is 'Does my rock hold water and will water flow through it?' This activity investigates the differences between porosity and permeability.

The activity can be used in any science or geography lesson where the ability of rocks to hold water or hydrocarbons is being discussed.
There are two activities for your pupils to try and, because they involve chocolate and LegoTM, they are very popular with children!
Related ideas about porosity and permeability can be seen on our website.