<span>A pier glass, otherwise known as a trumeau mirror is used in decorating a room. Pier glass was common in the parlors of homes during the 18th century. The mirror has a long and tall shape. You may often find it being in the same shape as the rooms windows. Pier glass can also be described as a mirror which is placed on a rooms pier. The pier being a wall between two windows that is supporting an upper structure.</span>
Answer:
The four selections use different media to present information about effects of human activities on the environment. There are advantages and disadvantages to each medium. For example, the photographs and diagrams in "A Natural Balance"
It is a simple sentence I think
