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In this lesson, we're going to discuss what each type of time is and why it is important so that you too can understand how they work to describe past events on Earth. Let's start with absolute time, also called chronometric time ('chrono' means 'time' and 'metric' means 'measure').
You can think of this type of time as how we normally view it on a day-to-day basis: specific intervals or moments measured in days, months, years, etc.
(Photo by Chris Linder, Woods Hole Oceanographic Institution)[ LESS ] Corals on Dongsha Atoll, a remote coral reef ecosystem in the northern South China Sea, were severely damaged in June 2015 when a 2°C rise in ocean temperature was amplified to 6°C on the reef by unusually calm weather.
Just like we know that dinner comes after lunch even though we may not know what time it occurs.So instead of human records, geologists use techniques such as radiometric dating.These processes involve sampling rocks and determining how old they are from their rate of decay.[ MORE ] WHOI scientist Rob Sohn, who has explored hydrothermal vents on the deep seafloor, is leading the HD-YLAKE project—a multiyear expedition that brings deep-sea technology to investigate the lake bottom.The research team emloyed a drilling platform operated by the National Lacustrine Core Facility at the University of Minnesota to extract long sediments cores from the lake floor, which hold clues to past events in the lake’s geologic and climate history.