Radiometric dating simple english

These demonstrate that, of course, we do not know everything (and clearly never will), but we know enough.

Today, innovative techniques provide further confirmation and understanding of the history of life.

Also includes info on how fossils are formed, the “cleaning, preparing, & repairing” of fossils, and other useful resources.

The dating method is usually performed on the mineral zircon.

Fossils document the order of appearance of groups and they tell us about some of the amazing plants and animals that died out long ago.

Fossils can also show us how major crises, such as mass extinctions, happened, and how life recovered after them.

Biologists actually have at their disposal several independent ways of looking at the history of life - not only from the order of fossils in the rocks, but also through phylogenetic trees. Relative dating is done by observing fossils, as described above, and recording which fossil is younger, which is older.

The rejection of the validity of fossils and of dating by religious fundamentalists creates a problem for them: Fossil sequences were recognized and established in their broad outlines long before Charles Darwin had even thought of evolution.

Results from different techniques, often measured in rival labs, continually confirm each other.

Every few years, new geologic time scales are published, providing the latest dates for major time lines.

The methods are all based on radioactive decay: The first radiometric dates, generated about 1920, showed that the Earth was hundreds of millions, or billions, of years old.

Since then, geologists have made many tens of thousands of radiometric age determinations, and they have refined the earlier estimates.

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