Perimenopause Age. There is not a set age for perimenopause to start; however, most women report the first symptoms in their early 40s. Since that is only an average, beginning perimenopause at an older or younger age signifies nothing.here is not a set age for perimenopause to start; however, most women report the first symptoms in their early 40s. Since that is only an average, beginning perimenopause at an older or younger age signifies nothing.
The surface of Venus is covered by a dense atmosphere and presents clear evidence of former violent volcanic activity. It has shield and composite volcanoes similar to those found on Earth. Relative to the Moon, Mars or Mercury, Venus has few small impact craters.fter the Moon, Venus was the second object in the Solar System to be explored by radar from the Earth. The first studies were carried out in 1961 at NASA 's Goldstone Observatory, part of the Deep Space Network.
Gneiss Facts. Gneiss (pronounced nice) is a type of metamorphic rock that forms when a sedimentary or igneous rock is exposed to extreme temperatures and pressure. When this happens, virtually no traces of the original rock remain. Gneiss rocks are characterized by their arrangement of minerals into long bands.neiss rock is further characterized by its alternating light and dark bands of minerals. Gneiss forms from volcanic rock, shale, or granitic. Quartz is typically abundantly found in gneiss. The bands that form on gneiss rock are due to the various rocks that are a part of its make-up.