Which natural element was added to the National Park Service's arrowhead logo during its 1952 redesign that remains a key component of its identity today?

The National Park Service has been protecting America's natural treasures for over a century. Throughout its history, the NPS has used various logos and visual identities to represent its mission of preserving the nation's natural and cultural heritage. This poll tests your knowledge about the evolution of the National Park Service's iconic arrowhead logo, which has become synonymous with America's protected wilderness areas.

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A sequoia tree
A mountain range
A bald eagle
A waterfall