Clay minerals are a major constituent of the earth's surface and are mainly found in the sediments of lakes, rivers and oceans. The properties of clay and claystone crucially depend on how the tiny ...

If you've got a stony, sandy garden, read on.

Quick clay is actually an old seabed. The clay thus formed under water, but came to the surface when the landscape rose after the last ice age. However, this clay was not so dangerous, because it was ...