100+ Natural cast forms PowerPoint (PPT) Presentations, Natural cast forms PPTs

Natural cast forms - PowerPoint PPT Presentation

The Fossil Record

The Fossil Record. Fossil Record. Provides evidence about the history of life on Earth. Shows how different groups of organisms have changed over time. A natural cast forms when flowing water removes all of the original tissue, leaving an impression.

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793 views • 45 slides

Geologic Time

Geologic Time. Geologic Time. By examining layers of sedimentary rock, geologists developed a time scale for dividing up earth history. Earlier in the 20 th century, radiometric-dating techniques allowed scientists to put absolute dates on divisions in the geologic time scale.

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791 views • 42 slides

Ch 12: The History of Life

Ch 12: The History of Life. 12.1 The Fossil Record. Specific environmental conditions are necessary in order for fossils to form. 12.1 The Fossil Record. Fossils can form in several ways. . Permineralization occurs when minerals carried by water are deposited around a hard structure.

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398 views • 27 slides

Evidence for Evolution

Evidence for Evolution. Evidence. Evidence of common ancestry among species comes from many sources. #1 Fossil Evidence. Fossils Earth is Millions of years old! Fossils in older layers are more primitive than those in the upper layers. Extinct Fossils resemble modern animals .

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485 views • 23 slides

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Natural cast forms - PowerPoint PPT Presentation

The Fossil Record

Geologic Time

Ch 12: The History of Life

Evidence for Evolution