1. What is meant by the term \"Precambrian\"? 2. What eons are included in the P

Question

1. What is meant by the term "Precambrian"?
2. What eons are included in the Precambrian, and what are their beginning and end dates?
3. Why don't we find any rocks that have formed on Earth in the first 560 million years of the planet's history?
4. Explain why we can use meteorites to provide a date for when the Earth formed?
5. What two things do the zircon crystals found in Australia tell us about the early Earth?
6. Why are the oldest rocks exposed on Earth found in the middle of continents? Think of the very old rocks found in Canada for example.
7. What is the significance of ULTRAMAFIC lavas in Archean rocks? Do these form today?
8. Describe plate tectonics in the Archean. How is it different today?
9. What does the absence of oxides such as hematite tell us about the conditions on the planet in the Archean?
10. Describe Archean life based on the fossil evidence we have. Did it need oxygen? Do we have anything like these organisms today?

Explanation / Answer

Answer-1)Precambrian era meansa geological time which was started millions of years ago.This is a life span time of earth.When the earth started being a life supporter of organisms,geologist scaled that evolving time of earth in many eras.It preceded the cambrian era that's why we called it precambrian era.

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