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www.reference.com/science/earth-kids-8940a7933ec39423

One interesting Earth fact that kids should know is that Earth is the only planet with an atmosphere that contains 21 percent oxygen. It is also the only planet known to contain life. The Earth is the third planet from the sun and the fifth largest planet in the solar s...

www.reference.com/article/earth-day-358a56b28a71a70c

Gaylord Nelson founded Earth Day. It was renamed officially by the U.N. in 2009 as International Mother Earth Day, and some schools and communities celebrate the day for an entire week. Also, the first Earth Day was celebrated on April 22, 1970.

www.reference.com/article/earth-day-activities-kids-7d5c7df52298fe4

Depending on the age of a child, Earth Day activities include making bird feeders out of pine cones, peanut butter and seed; upcycling jars to make candle votives; and decorating old cans to hold buttons, coins or flowers. Planting flowers and trees is another way to co...

www.reference.com/article/interesting-earth-day-2eb15d8fde2e967

Earth Day began in the late 1960s following the Vietnam War and was originally created with political aims. The Earth Day holiday on April 22 actually follows the first Earth Day of the year on March 20, the spring equinox.

www.reference.com/article/earth-43e8a25a6c575d7f

Earth formed around 4.54 billion years ago and is the third planet from the Sun. It is the fifth largest planet in the solar system and the largest of the terrestrial planets. It is also the densest of all the planets.

www.reference.com/article/animal-kids-69884c77dc7de38f

A leopard's tail is as long as its entire body. This helps the leopard maintain balance and make turns more quickly. The leopard is a fast, solitary mammal that reaches speeds up to 35 miles per hour. Birds and dinosaurs are the alligator's closest relatives. These rept...

www.reference.com/article/ocean-kids-908c5e3dec86a892

Only about 30 percent of the Earth's surface is dry land, oceans make up the remaining 70 percent. Earth's oceans are home to hundreds of thousands of marine life forms, but because most of the ocean depths remain unexplored, hundreds of thousands or even millions of un...