For example, you can recover photos from a recovery mode iPhone. Launch the iPhone Data Recovery on your computer, and you will get the interface as follows. Choose the second recovery mode, and select your iTunes backup file which you want to recover from.
The sub-family of rocks that form from volcanic lava are called igneous volcanic rocks (to differentiate them from igneous rocks that form from magma below the surface, called igneous plutonic rocks). The lavas of different volcanoes, when cooled and hardened, differ much in their appearance and composition.olcanic rocks are usually fine-grained or aphanitic to glass in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are identifiable with the unaided eye.
Thus, the rate of cooling of a felsic and mafic lava flow could be the same, but the felsic flow would form a glass because it is packed with silica. Here are three different types of a glassy volcanic rock called obsidian. Note the curved, conchoidal fracture surfaces. Obsidian is commonly black.f a rock looks like a block of (colored) glass, with no visible mineral crystals, it has a glassy texture. Superficially, a glassy texture suggests cooling that was so extremely fast that no crystals could form.