Discuss the word ‘erosion’. Children to talk about their ideas then go through the explanation on the slides.
Explain that although rocks are generally very hard and strong, it is possible to wear them away. Show children the pictures of the Grand Canyon on the slides and explain how the formations were formed over thousands of years by water wearing away (eroding) the rock.
How do you think we could set up an experiment to test different rocks to see how much they wear away? Give children some time to discuss ideas then share with an adult at home.
Go through the suggestion on the slides.
Do you know what the word ‘permeable’ means? Children to talk about their ideas then go through the explanation on the slides.
How could you test the permeability of different rocks? Again, children to talk about their ideas then go through the explanation on the slides.
Have a go at the experiment at home. You will need to find 2 rocks from your garden. Please complete the first sheet and last sheet for your work today.