It was Earth Day last Friday (& Good Friday too). The event was founded in 1970 by United States Senator Gaylord Nelson (read more here). In 2009, the United Nations named it International Mother Earth Day.
It's time for us to understand our Mother Earth more and to take care of her. I discovered The Encyclopedia of Earth a few months ago while preparing lessons. It's a peer-reviewed site that contains articles of various topics about our Mother Earth. They are written by professionals around the world. If you wanna shared your knowledge, you can also become a contributor.
Happy Earth Day!