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You can add materials to clay to gain desired results. For example, you can add sand to prevent tiny breaks of or lines from forming in the finish finished product. But you should not use sand from the coasts of occiansoceans. Instead, you should use sand from rivers or from other areas of land that are not near the sea.

You can usually find good clay in low areas of islands or land, especially if all ** have be formed volcanoes helped form the land. Clay often exists in fields covered with some water. The clay will be found aboutone  1 meter below the ground. River banks often also have clay aboutone  1 meter or less under the surface.

You can recognize clay because it is very shinny shiny when it is wet. You'd You can also perform a test: take . Take some of the material and add enough water to it to make it seem like you were are making bread. Then press it in your hand and to let until it is about the size of an egg. It is probably clay if it is hold holds together instead of falling apart when you stop pressing.

听写于：2008-9-1 11:31	用时：965
正确率：89 %(+19分)	错误：17个单词