Because Clay falls off of the edge off the edge of the cavern in different places around the cavern, due to weathering. Then, as limestone is being brought into the cave, also by weathering, clay goes throught the weathering process and then though becomes in an unusual shape.
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Square and scalene triangle are shapes.
Some shapes that are close to the rhombus are the square and kite.
Some shapes can have 19 edges but not most shapes.
Unusual
The congruent and symmetrical shapes are shapes that have at least a line of symmetry. Some examples:isosceles trianglesequilateral trianglessquaresrectanglesisosceles trapezoidsregular pentagonany regular n-gon shapes!There are many congruent shapes that follow the given conditions!