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Dating on earth release

June 2018 also marks the 42nd consecutive June and the 402nd consecutive month with temperatures, at least nominally, above the 20th century average.

June 2018 was characterized by warmer-than-average conditions across much of the land and ocean surfaces, with the most notable warm temperature departures from average across central Asia where temperatures were 4.0°C (7.2°F) above average or higher.

This relative abundance is expressed as the Sr ratio, where strontium-86 is chosen to represent the stable isotopes strontium-88, strontium-86, and strontium-84, which occur in constant proportions in natural materials.

Thus, a precise measurement of the Sr ratio in a modern volcano can be used to determine age if recycled older crust is present.

The ten warmest Junes on record have occurred since 2005, with 2016 the warmest June at 0.91°C ( 1.64°F).The rubidium–strontium pair is ideally suited for the isochron dating of igneous rocks.As a liquid rock cools, first one mineral and then another achieves saturation and precipitates, each extracting specific elements in the process.This difference may appear small, but, considering that modern instruments can make the determination to a few parts in 70,000, it is quite significant.Dissolved strontium in the oceans today has a value of 0.709 that is dependent on the relative input from the continents and the ridges.

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Overall, the global annual temperature has increased at an average rate of 0.07°C (0.13°F) per decade since 1880 and at an average rate of 0.17°C (0.31°F) per decade since 1970." [NOAA global analysis for 2016 accessed March 6, 2017].

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