Sequencing the rock layers will show students how paleontologists use fossils to give relative dates to rock strata.
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Recent research has found life at 3.4 billion years and, most recently 3.7 billion years.
The discovery was made in the Nuvvuagittuq Greenstone Belt in Northern Quebec in rock known as "banded iron formations." These formations existed billions of years ago, a result of organisms reacting with dissolved iron in the water that covered the planet. Johnathan O'Neil, assistant professor at the University of Ottawa's Department of Earth and Environmental Sciences, holds a sample of rock taken from the area where he and the research team discovered microfossils of the oldest life forms ever found on Earth.
Scientists believe that about 4.3 billion years ago, water already existed on Earth's surface.
However, what isn't known is when the earliest life emerged.
Simply counting the number of rings will give one a fairly good idea of the age of the tree.
Periods of heavy rain and lots of sunshine will make larger gaps of growth in the rings, while periods of drought might make it difficult to count individual rings. When a given quantity of an isotope is created (in a supernovae, for example), after the half-life has expired, 50% of the parent isotope will have decomposed into daughter isotopes.These ions are accelerated in an electric field through collimating slits and subject to a magnetic field which causes the ions to follow a curved path. By adjustment of the strength of the magnetic field and suitable placement of an ion collector, the different isotopes can be measured with precision.There are some things that affect these measurements. As an amateur astronomer, Nicole can be found looking up at the night sky appreciating the marvels of our universe.She is the editor of the Journal of the Royal Astronomical Society of Canada and the author of several books.In this activity, students begin a sequencing activity with familiar items letters written on cards.