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 Field Trips Life in the Extreme Grade Level: Middle School: Sixth Grade through Eighth Grade Subject: Math,Science State Standards: NATIONAL/STATE STANDARDS: CCRA.W.1, CCRA.W.10 NGSS.SEP.1-8 Background Craters of the Moon is one of the harshest environmen