It is important to maintain septic systems in order to
a. prevent treated sewage from contaminating groundwater
b. process human waste into fertilizer
c. prevent untreated sewage from contaminating groundwater
d. none of the above

Which plate boundary causes plates to collide forming mountain ranges, volcanoes, and island arcs? give an example of this type of plate boundary. 2. at which plate boundary do rifts and mid-oceans ridges form? give an example of this type of plate boundary. 3. at which plate boundary do plates slide past each other while moving in opposite directions? give an example of this type of boundary.