A. How old is the Earth? B. How long did the longest eon (so far) last? C. How many years ago did the most recent epoch begin? D. How many mass extinction events has the Earth witnessed so far?
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- Which eon has more events occurring in it? During which eon did life evolve? What is the difference between background extinctions and mass extinctions?We live in the Cenozoic era, and scientists know more about this era and the epochs it’s divided into than any other time period. Why is this? A. We know more about the Cenozoic era because this is the only era that has had a wide diversity of species living on Earth. B. We know more about the Cenozoic era because this is the most recent time period in the history of the Earth, and we have more information available to study. C. We know more about the Cenozoic era because the planet’s poles reversed magnetic fields at the beginning of this era. D. We know more about the Cenozoic era because fossils don’t exist to document previous eras.WHAT IS MASS EXTINCTION? HOW DID MASS EXTINCTION EVENTS INFLUENCE EARTH'S HISTORY?
- Which of the following theories as regards the origin of life on earth is accepted today? A. Theory of spontaneous generation B. Theory of special creation C. Cosmozoic theory D. Theory of abiogenesisIf a sixth extinction event is occurring, how is it similar or different from the previous five mass extinctions? What sort of evidence do you think scientists look for to determine whether we are living through a mass extinction?Which of the mass extinctions was the largest? What percentage of life went extinct during that time?
- HOW MANY YEARS AGO DID THE MOST RECENT EPOCH BEGIN? HOW MANY MASS EXTINCTION EVENTS HAS EARTH WITNESSED SO FAR?According to "Our Earliest Ancestors", what time period is being discussed in this video? A.The Eocene B.The Miocene C.The Pleistocene D.The PaleoceneWhat is meant by the term fossil fuel? a. In order to obtain energy from these fuels, a technique known as fossilization must be used. b. The fuel was formed from ancient plant and animal life, representations of which are sometimes found as fossil imprints. C. The fuel itself must be taken from older rock samples that frequently contain embedded fossil remains. 7.
- The fossil record shows that in just the last 600 million years, there have been five instances of sharp decreases in the diversity and abundance of living organisms. what are these events? a. droughts b. mass extinctions c. reversals of the earth's magnetic field d. great migrationWhich of the following do not provide evidence that a meteor strike was a partial cause of the Cretaceous-Paleogene mass extinction? a. A potential meteor crater off the coast of Mexico b. High layers of iridium in soil deposits in the geologic record at that time c. Shocked quartz was formed in large quantities at that time around the potential impact site d. An ozone hole appeared in the atmosphere at the time of the meteor strike(A) What is extinction? How extinction is different from expiration? Explain. (B)List the five mass extinction episodes occurred in the history of Earth. Characterize the nature and extent of each extinction episode.