Physics
The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall

Depends on the area of the wall
Increases with depth of the wall
Increases with height of the wall
Depends on the thickness of the wall

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Physics
It takes much longer to cook food in the hills than in the plains, because

n the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere

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