clay

A lake is flanked by layers of browns: rust, clay and beige, with the gradual excavation of earth.

To Didion, Kennedy represented something insidious in the American character: the desire for voters to admire politicians like movie stars, and the pandering of American politicians to provide heroes made of clay.

The overlying rock, sometimes clay or sandstone, will then suddenly collapse into the depression beneath - called a 'collapse sinkhole'.

And roofs are laid with either concrete or clay tile.

That would allow the three-time Grand Slam champion the opportunity to get in some competitive action on clay before heading to the French Open.