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- The radioactive element carbon-14 had a half-life of 5750 years. A scientist determined that the bones from a mastodon had lost 59.6% of their carbon-14. How old were the bones at the time they were discovered? The bones were about _ years old ? (Round to the nearest internet as needed )A fossilized leaf contains 70% Of its normal amount of carbon- 14. How old is the fossil? Use 5730 yesrs as the half-life of carbon- 14.The Cambrian explosion occurred about 540 million years ago. Express tht time n scientific notaion
- If humans originated in Africa and migrated to other parts of the world some time would be required for this to occur. At a modest rate of one kilometer per year, how many centuries would it take for humans originating in Africa to migrate to China some 10,000 kilometers away? SHOW YOUR WORK to support your results.A rock sample which originally contained 400 grams of radioactive isotope X now contains 25 grams of the material. The half-life of isotope X is 10,000 years. How old is the rock sample? (Give your answer without any punctuation or lables. For example: 15000).Suppose that one species of index fossil lived between 410 and 380 mya and another lived between 440 and 350 mya. What can be said about the age of a rock that contains fossils of both species? Figure 24.22 Absolute Dating of Sedimentary Rocks See Exercise 7.
- The length (in centimeters) of a typical Pacific halibut t yr old is given approximately by the following. f(t) = 210 (1-0.959e-0.2t) What is the length of a typical 8-yr old Pacific halibut? (Round your answer to the nearest whole number.) ______________cmWhich of the following is the best way to measure the age of the Earth? Examine rocks collected in my backyard. Analyze maps of all known fossil sites in the United States. Test the rate of decay of specific elements in rock samples. Explore leaves embedded in ash from recent volcanic eruptions.Include pictorial representation too.
- How many times great is the mass of the heaviest turtle than the mass of the lightest turtle. All measurements are rounded to the nearest 1/10 kilogramMark the Miller indices of crystallographic planes:Based on the problem below, how old is the rock? (ANSWER IN SCIENTIFIC NOTATION, UNIT SHOULD BE IN YEARS