Define relative age dating

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Relative dating does not provide actual numerical dates for the rocks.

Fossils are important for working out the relative ages of sedimentary rocks.

For a fossil to be a good index fossil, it needs to have lived during one specific time period, be easy to identify and have been abundant and found in many places. If you find ammonites in a rock in the South Island and also in a rock in the North Island, you can say that both rocks are Mesozoic.That is, scientists cannot tell exactly how old the layers are in years to the present date, only which is older than the other.Techniques such as radioactive dating, including carbon dating, focus more on the absolute age of an object.Suppose you find a fossil at one place that cannot be dated using absolute methods.That fossil species may have been dated somewhere else, so you can match them and say that your fossil has a similar age.Some of the most useful fossils for dating purposes are very small ones.For example, microscopic dinoflagellates have been studied and dated in great detail around the world.Ku naszej uciesze apel spotkał się z dużym zainteresowaniem i w krótkim czasie napisało do nas kilkanaście osób, które zaoferowały swoją…Ogłoszony w styczniu ubiegłego roku Słoneczny konkurs, który prowadziliśmy przy współpracy z Towarzystwem Obserwatorów Słońca im. W czterech etapach uczestnicy próbowali swoich sił w dziedzinie szkicu i fotografii powierzchni i zjawisk zachodzących na naszej Dziennej Gwieździe.Students begin by observing a photograph and a diagram of rock layers near Whanganui, watch an animation about how the layers were formed, then use an interactive labelling diagram to work out the order in which the rocks were created.The activity offers literacy opportunities as well as practice using the science capability 'Interpret representations'.

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