The region's hard-packed clay soil welcomes a unique mix of plants with deep-penetrating root systems.

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He said the clay soil had absorbed recent rain and snow, making it more unstable.

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Women of the Bakgatla ba Kgafela community of Botswana practice earthenware pottery-making skills using clay soil, weathered sandstone and other materials to make pots of different forms, designs and styles that relate to the traditional rituals and beliefs of the community.

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First is a core of rock, then clay and lastly soil, topped with grass seed that will withstand being walked on.

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The jury has heard that the wall failed after pressure from infill which included soil, clay and builders' rubble.

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Over a two-year experiment, we saw that there was a change in the soil structure as a result of a wetting and drying of the soil in clay-rich soils, and that can increase the amount of structure and hence storage of water.

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This is thanks in part to the climate and in part to the soil, a mixture of limestone and clay and thousands of fossilized oyster shells (a wine snob could probably even name the type of oyster).

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On thermal satellite images, the soil here seemed to retain its heat unusually well a sign that it might contain clay or other hydrated minerals.

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