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 Student Activities Leafy Thermometers and Rain Gauges Grade Level: High School: Ninth Grade through Twelfth Grade Subject: Science During this six-part activity, students investigate climate and climate change. Using fossil leaves from southwestern Wyomin