Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites. National Park Service Search Exiting nps.gov Rate the Lesson Plan Girl Scouts Cadette Eco Trekker at Carl Sandburg Home NHS Grade Level: Middle School: Sixth Grade through Eighth Grade Subject: Science For this activity you will explore the Carl Sandburg Home NHS while also earning your Eco Trekker badge. You can do thi