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It is also difficult to determine the exact age of the oldest rocks on Earth, exposed at the surface, as they are aggregates of minerals of possibly different ages.

Studies of strata, the layering of rocks and earth, gave naturalists an appreciation that Earth may have been through many changes during its existence.

In this context, the word "absolute" is not the opposite of "approximate" but just of the word "relative".

A method of dating which was accurate to within a billion years either way would still technically speaking be a method of absolute dating, it would just be a very bad one.

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.

By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.

Suppose that we wanted to find out how long it has been since an hourglass was set running by measuring the amount of sand in the lower bulb.

Following the development of radiometric age-dating in the early 20th century, measurements of lead in uranium-rich minerals showed that some were in excess of a billion years old.

During the same interval of time in another part of the world, the land surface subsided and was covered by the seas.

With the sinking of the land surface, sediments were deposited on the ocean floor.

For example, it is believed that during a particular episode the land surface was raised in one part of the world to form high plateaus and mountain ranges.

After the uplift of the land, the forces of erosion attacked the highlands and the eroded rock debris was transported and redeposited in the lowlands.

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Its success led to an extended production run of more than 7,800 aircraft between 19, in the United States, Japan, and Italy. The Canadair Sabre added another 1,815 airframes, and the significantly redesigned CAC Sabre (sometimes known as the Avon Sabre or CAC CA-27), had a production run of 112.