Earth History Deep Time: Measuring the age of the earth por Anne E. Egger, Ph.D. Lectura Prueba Enseñe con esto What is the assumption that Christian scholars made in calculating the age of the Earth from the Bible? That Earth is a homogenous solid. That human history and Earth history were the same length of time. That Earth processes occur in cycles. That Earth cooled from a temperature of 3900° C. James Hutton provided the first scientific calculations of the age of the Earth. true false What is the evidence at Siccar Point that Hutton used to support the long-term, cyclic nature of Earth processes? The orientation of two different rock types. The rate of soil erosion. The presence of radioactive elements. The location of Siccar Point on the sea. William Thomson (Lord Kelvin) calculated the age of the Earth assuming that it had cooled from a completely molten state. Which of the following data were important in his calculation? Measurements of the geothermal gradient. Measurements of activity from radioactive decay. Rates of soil erosion. The proportion of lead isotopes. William Thomson's assumed that Earth was a homogenous solid. This assumption made his calculations of the age of the Earth _____. accurate impossible too young too old John Perry questioned WIlliam Thomson's assumptions and recalculated the age of the Earth using the same equations. Which of the following caused the biggest difference in the calculated ages? Assuming a homogeneous composition of Earth Including a partially fluid interior of the Earth. Including a crust of different composition that the interior. Including updated geothermal gradient measurements. The heat produced by the radioactive decay of elements does not have a significant impact on calculations for the age of the Earth. true false How are parent-duaghter pairs of isotopes related? A parent isotope is produced by the decay of a daughter isotope. If a parent isotope is radioactive, the daughter isotope is also radioactive. Parent isotopes are radioactive and daughter isotopes are nonradioactive. A parent isotope decays to a daughter isotope. The concept of "deep time" describes _________. timescales of millions to billions of years. the timespan of human history. the half-lives of radioactive elements. the time of one of Hutton's "cycles" The age of the Earth is _____________. 3 billion years 4.54 billion years 20-40 million years unknowable Resultados de Prueba