Large asteroid impacts can melt significant amounts of material from Earth's crust (artist's impression). Credit: NASA, Don Davis Large asteroid impacts can melt significant amounts of material from ...

ROCK crystal, quartz, the common crystallised form of dioxide of silicon SiO2, is, from many points of view, the most interesting of all minerals and the most instructive example of crystalline ...

Asteroid impacts are catastrophic events that create huge craters and sometimes melt parts of Earth's bedrock.“ Nevertheless, craters are often difficult to detect on Earth, because erosion, ...