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.
Civil engineers and house builders need to take into account many different properties of rocks, of which the shrinkage of clay is one important factor. We investigate others in
'related activities' which can be found on the home page of the
website.
Please note:
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."
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