Rocks are made of more than 1 substance
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if the concentration of a substance at the surface of another substance is more than in the bulk of the adjoining phases, it is called positive surface.
A building made of bricks.
No the Ratio of a mixture are not exact, one mixture might have more substance than the other but it is still a mixture.
More than 35 triangles can possibly be made in a triangle..!
they were made that way