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Answer:

The only change is atmospheric pressure on the rock if it is on a hill.

Please refer to the question: http://wiki.answers.com/Q/What_will_happen_in_100_years_to_a_7_lb_rock ?

The form of "a 7lb rock" in 100 years varies according to reactions:

- Chemical Reactions:
- chemical properties of the rock(i.e: includes salt),
- the behaviour of the medium it is kept(i.e: humid or dry environment, solvent materials),

- Physical Reactions:
- External forces applied to the rock(i.e: acceleration),
- Inertial forces of the rock. (i.e: surface tension).

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