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The Precambrian Era is the least understood part of Earth history, yet it is arguably the most important. It began with the formation of Earth nearly 4.6 billion years ago, and lasted for approximately 4 billion years. During this time, all of Earth’s major systems appeared, such as the hydrosphere, biosphere, geosphere, and atmosphere. The Precambrian Earth experienced impacts by massive celestial objects, the first continents and ocean basins, mobilization of tectonic plates, an oxygenated atmosphere, and the origin and evolution of early life. Not only did life begin and survive during this challenging, harsh time period, but it thrived and continued to evolve. The evidence for the story of the Precambrian era is within Earth’s rocks. Where on Earth’s surface do you think scientists can locate rocks from the Precambrian era? How do scientists determine the age of the rocks they’re analyzing? What types of tests or analyses do you think scientists would conduct on a rock from the Precambrian era? Lastly, how does understanding the Precambrian era enhance our chances of finding another planet that could one day support life?


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Answer:

They can be found in Greenland; the interesting Burgess shale (Cambrian); they date the rocks with isotopic (radiometric) dating; Precambrian conditions resemble those that can be found in other planets where life could have appeared.

Explanation:

Rocks from the Precambrian are necessarily very old. One such place is Greenland where scientists have been studying the geology and geochronology (age of the earth) for many years. In order to determine that a rock is of a Precambrian origin, its age must be known and for such old rocks scientists have developed isotopic dating methods, which use the rate at which one radioactive isotope decays into another, usually in the order of many million years. The Precambrian lasted for a very long time, yet the living things during all that time were single-celled. It was during the Cambrian (see the fascinating Burgess Shale story by Steven Jay Gould) that multicellular organisms first appeared in all their complexity. These Precambrian single-celled organisms however, were capable of tolerating the harshest environmental conditions of the young Earth, like scorching heat and gases that would be poisonous for most living things that thrive on Earth today, so understanding those early conditions of the Precambrian may shed light on life forms that could be found in other planets that have similarly harsh conditions.

Answer:

Rocks from the Precambrian are necessarily very old. One such place is Greenland where scientists have been studying the geology and geochronology (age of the earth) for many years. In order to determine that a rock is of a Precambrian origin, its age must be known and for such old rocks scientists have developed isotopic dating methods, which use the rate at which one radioactive isotope decays into another, usually in the order of many million years. The Precambrian lasted for a very long time, yet the living things during all that time were single-celled. It was during the Cambrian (see the fascinating Burgess Shale story by Steven Jay Gould) that multicellular organisms first appeared in all their complexity. These Precambrian single-celled organisms however, were capable of tolerating the harshest environmental conditions of the young Earth, like scorching heat and gases that would be poisonous for most living things that thrive on Earth today, so understanding those early conditions of the Precambrian may shed light on life forms that could be found in other planets that have similarly harsh conditions.

Explanation:

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