The new ELI published today is 'Testing rocks 3 - that shrinking feeling'. Pupils investigate the percentage shrinkage of damp clay when it dries out and relate this to potential engineering problems.
We have amended one of our earlier activities - 'Metamorphism - that's Greek for change of shape', isn't it?' One of our translators discovered that we had made a mistake. The fifth point in Underlying principles should read "Flaky minerals in a mud-rock (such as clay minerals) recrystallise into other flaky minerals (such as micas) to lie perpendicular to the forces which affected the rock."