Describe absolute dating and relative dating
In a way this field, called geochronology, is some of the purest detective work earth scientists do.There are two basic approaches: relative age dating, and absolute age dating.Though using similar methods, these two techniques differ in certain ways that will be discussed in this article.As the name implies, relative dating can tell which of the two artifacts is older.That’s because zircon is super tough – it resists weathering. Each radioactive isotope works best for particular applications.The half-life of carbon 14, for example, is 5,730 years.Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.
Say for example that a volcanic dike, or a fault, cuts across several sedimentary layers, or maybe through another volcanic rock type.For example, which is older, the bricks in a building or the building itself?Are there repairs or cracks in the sidewalk that came after the sidewalk was built?Dating is a technique used in archeology to ascertain the age of artifacts, fossils and other items considered to be valuable by archeologists.There are many methods employed by these scientists, interested in the old, to get to know the age of items.
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Unlike people, you can’t really guess the age of a rock from looking at it.