(Photo courtesy of Washington State Archives)

Since 1970, April 22 has been observed as Earth Day. Over the years, the environment-themed celebration has meant a wide variety of activities geared toward protecting the environment and habitat, as was the case over the weekend and Monday.

The State Archives dug up this 2005 photo showing then-Governor Chris Gregoire and then-Superintendent of Public Instruction Terry Bergeson meeting with Olympia-area students who were doing environmental testing and habitat-restoration work at Priest Point Park in Olympia.