Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Question
Chapter 24.1, Problem 1R
Summary Introduction
To review:
The sites given in the figure below and assign each site to a geological period according to the table 1 and table 24.2 given below.
Introduction:
The ratio of 206Pb and 238U is known as uranium and lead dating. It is a radioactive dating technique used in earlier times was used to date rocks that were formed in between 1 million years to 4.5 billion years ago. The table 1 given below shows the ratio between the 206Pb and 238U and the estimated age of the sites given.
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The most useful method for dating ancient calcium rich cave deposits would be
Group of answer choices
A: Argon-Argon Dating
B: Paleomagnetic Reversals
C: Electron Spin Resonance Dating
D: Uranium-Thorium Dating
E: Potassium-Argon Dating
Which item is best dated using the potassium-argon (K-Ar) method?
Group of answer choices
A: Cave layers in South Africa
B: stone tools
C: Ancient dinosaur bones
D: organic materials
E: Lava flows found in the Olduvai Gorge
Use the following figure to answer questions 2 and 3.
mya - million years ago
1,00 mya = 1 bilhan yeas ago
|4,600 mya: Formation of Earth
4000 mya
|3,500 mya: Oldest known fosll
Present day
|2,000mya:Rrstmulticelled organisms
1,000 myu
3,000 myn
2000 mya
2. How old is the oldest known fossil?
3. How much time passed between the Earth's formation and the appearance of the first multicellular organ-
ism?
4. What key evolutionary event occurred 370 million years ago? Would this have been considered macro-
evolution or microevolution? Briefly explain your answer.
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- Radiometric 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?arrow_forwardA fossil is found to contain the radioactive parent and daughter isotopes uranium 235U, and lead 207Pb, in the ratio 12.5% to 87.5%. Assuming that no 207Pb was present when the fossil first formed, estimate the age of this sample.Please show some thought process and a therefore statement. Thank you very much, have a great day!arrow_forwardA paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive isotope potassium-40. The rock now contains 3 mg of potassium-40. The half-life of potassium-40 is 1.3 billion years. From this information, you can conclude that the rock is approximately ______________ billion years old.arrow_forward
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- Suppose 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 =arrow_forwardList several significant events in the history of life on earth that are associated with the K-T Boundary.arrow_forwardUsing the principles of relative dating, put the rock layers, faults, and igneous intrusions in a sequence from youngest to oldestarrow_forward
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