Earth Day marks the anniversary of the birth of the modern environmental movement in 1920, according to earthday.org.
About 100 third graders at Thames Elementary celebrated the day by planting a few trees around campus.
A pecan tree was planted near the northeast corner of the school's campus, and an orange tree was placed near the northwest corner of the school.
The orange tree was planted in memory of long-time Thames school educator "Coach" Martha Nell Dedrick who passed away earlier this year.
Third grade teacher Matthew Smith said it is important to teach the kids to keep the environment clean and nurtured.
"We try to let them know that the environment, if we want to keep it healthy and safe, that we need to take care of it and by taking care of it we have to do our part by cleaning it and keeping it nurtured," Smith said.
Earth Day had reached into its current status as the largest secular observance in the world, celebrated by more than a billion people every year, and a day of action that changes human behavior and provokes policy changes, according to earthday.org.