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Radiometric dating is a technique used to determine the age of rocks. Geologists have used this technique to determine that:
A. |
The universe started with the "Big Bang." |
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B. |
Earth is about 6.2 trillion years old, and life appeared on Earth about 4.9 trillion years ago. |
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C. |
Earth is about 4.6 billion years old, and life appeared on Earth about 4.1 billion years ago. |
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D. |
Earth is about 4.6 million years old, and life appeared on Earth about 4.4 million years ago. |
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E. |
Earth is about 6.2 thousand years old, and life appeared on Earth about 6 thousand years ago. |
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- 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?In radiometric dating, scientists use the half-life of a radioactive isotope, to determine the approximate age of rocks, and the fossils that are embedded in them. Half-life is the time it takes for half of a radioactive element to become stable.Uranium 238 (238U) is a radioactive element that decays into Lead (206Pb) after 4.5 billion years. 6) Scientists found a fossil in a layer of rock that tested as 1/8th U and 7/8th Pb. What is the approximate age of the fossil? A) 562 million years old B) 4.5 billion years old C) 9 billion years old D) 13.5 billion years old Not GradedRadioisotopes are useful in dating fossils and rocks because a. they are present in very high amounts. b. they decay rapidly. c. they decay in a predictable pattern over long time period. d. their rate of decay changes over time.
- Choose the answer from the given concept below. A. Extraterrestial Origin B. Divine Creation C. Spontaneous Origin D. Big bang theory 1. this is the oldest among life's origin theories and the most accepted among others. It may vary vary on the practice of a religion, but it's commonality is that a Divine God created life. It is called the 2.Meteorite contains amino acids, nucleotide bases and sugar. Hundreds of thousands of meteorites and comets are known to have fallen into the early Earth, suggesting that it may contain some organic material. It is referred as the 3. Greek philosopher Aristotle proposed a theory eith the idea that living matter may arise from non-living matter. These are based on early observations such as the appearance of maggots in rotting meat, mice on corn and fish from mud of previously dry lakes(e) If you collected a sample of water being ejected from Saturn's moon, Enceladus, you could examine it for isotopic signatures of life. Explain why this might not be definitive and describe one other way in which you could test a sample of this water for biological material.9) Rocks containing fossil evidence have been found in Canada suggesting how life on Earth evolved. What about the rocks led to this belief? A) They contained graphite, a from of pure carbon. B) They contained fossil evidence of human remains. C) They were metamorphic rocks with traces of water. D) They were extrusive rocks that came from the volcanic vents. Not Graded
- The mathematical shape of the earth can be made as: a. Flat b. Almost any shape such as spheroid or ellipsoid c. Spheroid d. EllepsoidRadiometric dating does not measure the age of an individual atom. It is a measure of the age of a quantity of atoms—a statistic. As with any statistical measure, its values may deviate around an average (sampling error, Section 1.8). Imagine that one sample of rock is dated ten different ways. Nine of the tests yield an age close to 225,000 years. One test yields an age of 3.2 million years. Do the nine consistent results imply that the one that deviates is incorrect, or does the one odd result invalidate the nine that are consistent?55: Radiometric dating ... Group of answer choices A: is based on the scientific observation that unstable “parent” isotopes decay into more stable “daughter” isotopes at a constant rate B: involves some event that initiates a radiometric clock, such as when a plant or animal dies (radiocarbon). C: has helped us determine that the Earth is roughly 4.54 billion years old. D: provides an accurate means of determining the age of materials that are very old. E: All of these answers are true
- Martian meteorites found in Antarctica were determined to possibly contain life. Scientists looked skeptically at these meteorites because a. their results suggest unusual chemical signatures that do not indicate life. b. features thought to be Martian fossils could be nonbiochemical formations. c. it is impossible for a piece of the Martian surface to fall to Earth. d. both a and b are true.Which 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 strikeSuppose a scientist finds a rock with an interesting fossil. Curious to know the age of the fossil, she takes the rock to a lab. The lab determines the amount of rubidium (Rb) and strontium (Sr) in the rock. The scientist is familiar with radiometric dating and knows that she can now calculate the age of the rock, 1, using an isochron. The Rb-Sr isochron equation is 87. Rb. [edr – 1] 86 °Sr. 87 87 Sro 86 Sro 86 Sr. 87. Rb 3.807 and 89.60. In a published table, she finds that Using the lab's values, she calculates the isotope ratios as 86 Sr. 87 = 0.7129. She also finds that the decay constant, 86 the ratio of strontium-87 to strontium-86 at the formation of the rock was Sro 2, for rubidium-87 is 1.42 x 10-11. Use the equation and provided data to calculate t. Put your answer in scientific notation and round to the nearest tenth. years x10 What is the approximate age of the rock in billions of years? Round to the nearest tenth. billions of years t =