Try making adobe

Look at the video carefully. It shows the walls of the home made of adobe.

You can make a kind of adobe by using clayey soil and grass. Make the soil into a stiff mud and then mix in the grass. Then shape the mud into a block and leave it to dry.

When it is fully dry, try to find out

(a) What the grass does; and

(b) What happens to the brick if it should get wet..