Which of the following most significantly determines a communities’ access to potable water? a. access to clean raw water sources b. the availability of money c. local drought conditions d. the level of industrial development

answer is not A the answer is B. because more money i just took it  

all these collisions do one thing, and that thing is explained in the last option. when dusst, rocks and ice collide, they harden and form giant layers of rocks or hard ice.

d)   to harden materials to form different parts of earth’s layers

hope it ,

bioteacher101