ULUVULLYLUS
14-
Write the letter of the correct answer on the line
1. — About how many minerals make up
most of the rocks of Earth's crust?
A 2
B 20
C 200
D 2,000

What is point source pollution of an aquatic ecosystem? a) pollution of freshwater sources b) pollution from many sources that combine into one c) pollution that occurs over a wide area; water that runs off from fields, parking lots, and other land surfaces d) pollution that can easily be identified with a single discharge source, such as an open pipe which drains into a body of water