This form of molten rock is made up of dissolved gases, mineral crystals, and molten rock. Its silica content determines how durable it is. As a result of the presence of silicon, melting temperature ...

Geologists found evidence in the way enigmatic sandstones called Tava formed in the Rocky Mountains hundreds of millions of ...

These types of formations may also be formed by impact melting. See a pallasite meteorite on display in Hintze Hall. Mesosiderite meteorites are breccias, a variety of rock composed of broken ...