The first Earth day was on April 22, 1970. 20 million Americans took to the streets to demonstrate for a healthy, sustainable environment in massive coast-to-coast rallies. When you believe you have matched the correct pairs, click the 'Check' button to get your results. This event has grown into the largest civic event in the world. Earth Day is celebrated simultaneously around the globe by more than a billion people who participate in Earth Day campaigns every year. How well do you understand the vocabulary that is used to talk about Earth Day and the enviornment? In this exercise, you are asked to match words associated with Earth Day in the right column to the correct definitions in the left column. When you think that all the matches are correct, click the 'Check' button to get your results.