If you mean you can "scale" two similar triangles so that they become congruent, then yes.
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No, because then it would become an equilateral triangle.
A prism *always* has 2 bases. In case you meant "faces" instead of "bases", the prism with the smallest number of faces is the triangular prism - which has 5 faces. If there were any fewer number of faces, the prism which become a two dimensional object.
yes
through erosion
That depends on its dimensions.