An operational knowledge of conservation does not develop simutltaneously for all properties of material, coservsation of some properties develops before others, this is drawn by Piaget as a horizontal decalage.
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A horizontal line.A horizontal line.A horizontal line.A horizontal line.
A horizontal angle is an angle between lines on a horizontal plane.
this is horizontal: ---------------------------- / / this is at an angle: / / /
The horizontal line is called the horizontal axis
on the horizontal axis!