There are three main types of rock: igneous rock, metamorphic rock ... each of the three rock types has been continuously formed and recycled into other types of rock in a process called the “rock ...

This rock recycling is a process called the rock cycle ... compressed and glued together.Metamorphic rocks are formed from other rocks, igneous or sedimentary, which are heated and compressed ...

These plagioclase-rich igneous rock formations ... "Because the mantle was hotter in the past, this process directly connects the formation of massif-type anorthosites to Earth's thermal and ...

NASA's Perseverance rover has discovered a haunting rock formation on Mars that looks unsettlingly like a skull. Dubbed "Skull Hill," the jet-black outcrop is so bizarre and out of place that even ...

A separate theory suggests that the rock formation could be an igneous rock which was formed when lava or magma cooled down millions, or possibly billions, of years ago. Ms Dean explained that t ...