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A fossil will always be younger than fossils in the beds beneath it and this is called the principle of superposition.

In an undisturbed sequence of rocks, such as in a cliff face, it is easy to get a rough idea of the ages of the individual strata – the oldest lies at the bottom and the youngest lies at the top.

There must have been speeded-up decay, perhaps in a huge burst associated with Creation Week and/or a separate burst at the time of the Flood.

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These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.

As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.

The second method is called absolute dating and is done by analysing the amount of radioactive decay in the minerals of the rocks.

Scientists find out the age of a dinosaur fossil by dating not only the rocks in which it lies, but those below and above it.

Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.