Due to the weather, the Museum is closed on Tuesday, January 27. All Tuesday programs and some Wednesday programs have been cancelled. Please check here for a full list, and check back for regular updates.
The Museum will be open on Wednesday, January 28, during regular hours, from 10 am to 5:45 pm.
Regular updates will also be posted to our Facebook page and Twitter account (@AMNH).
Cooking with limestone
Some of the Kaibab limestone that melted during the Meteor Crater impact mixed with solid rock and bits of meteorite. It then solidified in midair, landing as "impactites." The heated limestone released carbon dioxide gas, leaving behind porous calcium oxide. Limestone cooked in a kiln undergoes this same reaction.
Coconino County, Arizona, USA
Topic: Earth Science
Keywords: Astrogeology, Collisions (Astrophysics), Impact, Limestone, Meteor Crater (Ariz.), Meteorite craters, Meteorites