Terms to do with the History of Life
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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Extinct | A species that has died out
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Paleontologists | Researchers who study fossils to learn about ancient life such as the structure of ancient organisms, their environment, and the way they lived
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Relative Dating | Determines the relative age of a rock layer or fossil by comparing its placement with that of fossils in other rock layers.
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Index Fossils | Used when scientists need to correlate the relative ages of the rock layers that carry them distant places
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Radiometric Dating | Relies on radioactive elements which decay or breakdown into nonradioactive elements at a steady rate
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Half-life | The time required for half of the radioactive atoms in a sample to decay
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Geologic Time Scale | A timeline of Earth that geologists and paleontologists have built
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Eras | What eons are divided into
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Periods | What eras are divided into (ranging in length from hundreds of millions of years to just 2 million years)
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Plate Tectonics | Huge plates that move in the past and continue to move on in the Earth's outermost layer
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Created by:
nelska09
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