Understand what half-life is. If I tell you how much of a radioisotope is left f
ID: 158881 • Letter: U
Question
Understand what half-life is. If I tell you how much of a radioisotope is left from the original sample and what the half-life is, you should be able to tell me how much time has passed. How is radiocarbon dating different from other radioisotope dating methods? What are magnetic polarity reversals? How do we know they happened? Why is it hard to do lithostratigraphic correlation over large distances? Why is it hard to do magnetostratigraphic correlation over large distances? How did absolute age dating make it possible for chronostratigraphy and biostratigraphy to become different types of stratigraphy? Before plate tectonics, what were some of the evidences Wegener and du Toit used to infer continental drift? What is the Gondwanaland sequence? The Gondwanaland sequence was Permian and Triassic in age. What evidence did polar wander provide that is consistent with this? Why is it significant that the Gondwanaland sequence has basalt at the top? What is the difference between Pangaea and Gondwana(land)? How did sonar help plate tectonic theory develop? Specifically: Tell me what Marie Tharp discovered. Tell me how Harry Hess used her discovery, and guyots, to figure out that plate tectonics occurs. What is the evidence that Harry Hess used to determine that sea floor spreading occurred? How did he know that the oceanic crust must be destroyed somehow? Why is continental crust far older than oceanic crust? How does a back-arc basin form? How does a rift basin form? What is a carton?Explanation / Answer
1.The time taken for the radioactivity of a specified isotope to fall to half its original value
2.Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon (14 C), a radioactive isotope of carbon.
3.It is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged. north-pointing compasses make a 180-degree turn toward Antarctica
4.Because lithostratigraphic are not always time-stratigraphic units,but time transgressive ones.
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