The new ELI today is an extension of one we published many years ago, 'See how they run; investigate why some lavas flow further and more quickly than others'.

This activity involves an investigation into some of the factors which can affect the viscosity of lavas. The two activities included involve varying the temperature and composition of the 'lava' using treacle and honey.

Other related activities can be found in our Natural Hazards category - Volcanoes.

   

Our ELI today is "Why does soil get washed away? - investigating why some farmers lose their soil through erosion whilst others do not".

The extension to the activity also gives some good ideas, including painting with different soil types.

Related activities can be found in our Earth Materials category - Soils and in Earth processes - Sedimentary processes.

   

Our ELI today is 'What catastrophic natural processes affected your region in the geological past? Use the evidence in your local region to interpret dramatic geological events'.

Many related activities can be found in our Natural Hazards category.

   

Now we are approaching exam time, our ELI today is a good revision exercise, as are the other activities in the 'Picturing . .' series - 'Picturing igneous rocks 1 - visualise and draw igneous rocks from a verbal description'.

Related revision activities can be found in the table at the end of each 'Picturing . . ' activity:

   

Following on from looking at metamorphic rocks last week, today we investigate an exceptional piece of slate - 'Every rock tells a story; reading the rock history from an exceptional specimen of slate'.

Related activities can be found in Rocks in our Earth Materials category.