It causes the water to evaporate from the earths surface so that it can cycle through again
Group 1 elements (usually called alkali metals) are not very electronegative and have small ionization energies due to that. The reason why they are not very electronegative is that they really want to loose their one valence electron so that they can have a noble gas electron configuration (completed octet).
I hope this helps.
The answer is (b) for example lemon juice is an acid and it tastes sour.
Hope this helps :).
