Gneiss is a metamorphic rock which forms due to the extremely high pressure and temperature condition. It is characterized by the coarse and medium-sized grains and there is the presence of alternating dark and light-colored bands on it. The light color band contains felsic minerals such as feldspar, quartz and the dark band contains mafic minerals such as biotite, hornblende, garnet. It is a very high-grade metamorphic rock. These characteristics helps in identifying a gneissic rock.
A geologist finds a layer of rock that is made of coarse-grained foliated particles arranged into bands and splits into sheets when struck with a hammer. The <span>type of rock did the geologist find is slate. The answer is letter D.</span>
The Galactic Center (or Galactic Centre) is the rotational center of the Milky Way galaxy; it is a supermassive black hole of 4.100 ± 0.034 million solar masses, which powers the compact radio source Sagittarius A*.
