Mechanical weathering does not change
a. the size of the rock
b. the chemical composition of
c. the rock the shape of the rock
d. the original weight of a rock

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.

The metal is named first

A.(nh4)(2co3)is the correct answer 

1) according to the law of conservation of mass ,in all chemical reactions total mass is unchanged