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The Slides are to be shown at the front and then each item is shown in turn and the pupils use their graphs to calculate the age of each item from the percentage of carbon found in them. take longer than you think, but keeps them engaged and there're questions to be answered in their books also.Easily modified for different abilities, with my low ability I made all the percentages either 75%, 50% or 25% to make it much easier for them. The worksheets can be used in a number of ways, I used them in two ways, I laminated them both in the same pouch front to back for them to use as a mini whiteboard and write directly on them with a whiteboard pen then rub out the ink for reuse for different questions and classes and to use as group work.However, scientists can look at the decay of other elements in these objects allowing them to date them up to 2.2 billion years.This is a slide and worksheet for radioactive dating and half life activity.Also used to describe the process of genetic change within a population, as influenced by natural selection.adaptive landscape: A graph of the average fitness of a population in relation to the frequencies of genotypes in it.That exposed the broad continental shelves now covered by the Bering Strait and created the land bridge. For years, scientists thought it disappeared beneath the waves about 14,500 years ago, toward the end of the last ice age.

adaptive radiation: The diversification, over evolutionary time, of a species or group of species into several different species or subspecies that are typically adapted to different ecological niches (for example, Darwin's finches).

Thus, as living things take in carbon, they inevitably will take up a small amount of radioactive carbon into their bodies.

When these lifeforms die, they stop taking in new carbon.

In Tom Clancy's book "The Hunt for Red October," a Russian submarine has a nuclear reactor accident with radiation leakage that forces the crew to abandon ship.

At Three Mile Island and Chernobyl, nuclear power plants released radioactive substances into the atmosphere during nuclear accidents.

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