Subject: Biology:Ecology:Habitats:Within Rock, Biology:Astrobiology, Microbiology Resource Type: Scientific Resources:Overview/Reference Work Grade Level: General Public, College Upper (15-16), Graduate/Professional, College Lower (13-14), High School (9-12) Extreme Environments: Anoxic, Extremely Hot Theme: Teach the Earth:Course Topics:EcologyKeywords: endolith, extremophile