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Bioevents either relate to diversification of a particular fossil group or a reduction, these may equate to speciation events or extinction events, or may only represent migration.Records of the appearance and disappearance of particular taxa at a single locality are insufficient to define a bioevent.Late Devonian Extinction was one of five major extinction events in the history of the Earth's biota.A major extinction, the Kellwasser event, occurred at the boundary that marks the beginning of the last phase of the Devonian period, the Famennian faunal stage (the Frasnian–Famennian boundary), about 375–360 million years ago.Also, because Earth formed as part of our sun’s family of planets – our solar system – scientists use radiometric dating to determine the ages of extraterrestrial objects, such as meteorites.These are space rocks that once orbited our sun, but later entered Earth’s atmosphere and struck our world’s surface.Ion is an Atom or a molecule in which the total number of electrons is not equal to the total number of protons, giving the atom or molecule a net positive or negative electrical charge.Ions can be created, by either chemical or physical means, via ionization. Oxygen is what makes the sky blue, molecules in the air scatter blue light from the sun more than they scatter red light.
A second, distinct mass extinction, the Hangenberg event, closed the Devonian period. A footprint of a reptile-like creature called an Isochirotherium - an ancestor of dinosaurs and crocodiles, that roamed the area 230 million years ago - was discovered in early April by a person out walking in Olesa de Montserrat, 40 kilometers (25 miles) north of Barcelona. Dinosaurs are a diverse group of Reptiles of the clade Dinosauria that first appeared during the Triassic period, which was a geologic period and system which spans 50.9 million years from the end of the Permian Period 252.17 million years ago (Mya), to the beginning of the Jurassic Period 201.3 Mya.
Over the following 70 to 80 million years, the rate of diversification accelerated by an order of magnitude and the diversity of life began to resemble that of today.
Almost all the present phyla plants (Asterids - Verbena) appeared during this period, with the exception of Bryozoa, which are a phylum of aquatic invertebrate animals who made its earliest known appearance later, in the Lower Ordovician. First land plants occurs in the Ordovician, in the form of fossil spores.
And as you got closer, it would almost disappear because of the tremendous amount of space there is between everything, like with atoms.
The Scale of the Universe from Big to Small (youtube) The Scale of the Universe from Small to Big (youtube) NASA Astronomy Picture of the Day (APOD) The Scale of the Universe - Interactive (manual control scale) Sizes (nano) Stars and Galaxies started to form.