Start Earth science lab relative dating 1 answers

Earth science lab relative dating 1 answers

For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.

Geologists have established a set of principles that can be applied to sedimentary and volcanic rocks that are exposed at the Earth's surface to determine the relative ages of geological events preserved in the rock record.

For example, in the rocks exposed in the walls of the Grand Canyon (Figure 1) there are many horizontal layers, which are called strata.

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

Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

Most sediment is either laid down horizontally in bodies of water like the oceans, or on land on the margins of streams and rivers.

Each time a new layer of sediment is deposited it is laid down horizontally on top of an older layer.

The study of strata is called stratigraphy, and using a few basic principles, it is possible to work out the relative ages of rocks.

Just as when they were deposited, the strata are mostly horizontal (principle of original horizontality).

Second, it is possible to determine the numerical age for fossils or earth materials.