A change will not change the chemical make-up of the substance. A change will form a new substance.

Rusting, burning, and decomposing are all changes.

Sublimation, melting, tearing, and grinding are all changes.

1. physical

2. chemical

3. chemical

4. physical

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

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