Discussion board and reply to two people - Science
Age is RelativeThe
question of age can be applied to humans, clothing, food, furniture,
and fossils. Doctors study how humans age and can observe how hair turns
grey and skin becomes wrinkled. Rocks and other organic materials do
not always provide observers the same outward changes. In order to
determine the age of a material; including human bones, radiometric
dating can be applied. Determining the amount of radioactive isotopes in
a geological or archeological specimen can help decipher its relative
age. Since all rocks and minerals contain radioactive elements, the
decay process is like a clock that a geologist can read since different
radioactive elements have independent “clocks” or half-lives. Read more
about radiometric dating in your textbook.For this unit, answer the following questions:Pick TWO of the following and describe how radiometric dating has been utilized to determine their age:
EarthMoonMeteoritesFossilsEarly manHistoric relics (i.e., Dead Sea Scrolls, Shroud of Turin)Volcanic eruptions
Identify one element used to date rocks and minerals. How long is its half-life?How can radioactivity be measured?Rocks,
minerals, and even food we eat can contain radioactive material. Why
doesn’t this radioactive material comprise a threat to humans?What is an alternative method to radiometric dating? What are the strengths and weaknesses to this type of dating process?Be sure to review the Discussion Board Course Rubrics.For help with citations, refer to the APA Quick Reference Guide.Use this reference when referring to your text:Trefil, J., & Hazen, R.M. (2016). The sciences: An integrated approach. Hoboken, NJ: John Wiley & Sons, Inc.
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this was hard!
Tyana Spragley posted Jan 2, 2020 9:02 PM
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this Discussion was not easy for me at all
Radiometric dating is a process of identifying the age of a material based on known half -lives of decaying
radioactive materials found in both organic and inorganic objects. Radiometric dating is often used to
determine the age of rocks, bones, and ancient artifacts. In fact, radiometric dating can be used to
determine the age of the Earth, (5.54 billion years old) other planets, and celestial objects. Radiometric
dating is often referred to as “radioactive dating” and “carbon dating,” though many different types of
isotopes can be used to identify an object’s age. While not all objects have the same isotopes, both
living and nonliving objects have some sort of decaying, radioactive isotope that can be used based on
known decay rates.
In fact, radiometric dating can be used to determine the age of the Earth, (5.54 billion years old) other
planets, and celestial objects. Radiometric dating is often referred to as “radioactive dating” and
“carbon dating,” though many different types of isotopes can be used to identify an object’s age.
How can radioactivity be measured?
Radioactivity is measured in disintegrations per second and its unit of measure is the Becquerel (Bq), in
honor of the physicist Henry Becquerel who discovered the spontaneous emission of radiat ion from
uranium in 1896. As mentioned above, the radiation produced by the disintegration of radioisotopes
interacts with matter, transferring energy.
Identify one element used to date rocks and minerals. How long is its half -life?
Radioactive elements are used to date the age of rocks. Radioactive elements decay according to a
known pattern. Scientists can use the elements of that pattern to determine when the rock with the
original radioactive element was formed.
What is an alternative method to radiometric dating? What are the strengths and weaknesses to this
type of dating process?
Paleomagnetism is not a perfectly good method of dating as search, but it has determined to be of
use in cases of sedimentary rocks, because other kinds of dating mainly study igneous rocks.
There are weaknesses that have occurred overtime due to inability to control the magnetic fields
since the data that is obtained might be in accurate due to a long duration of change of magnetic
patterns
Trefil, J., & Hazen, R.M. (2016). The sciences: An integrated approach. Hoboken, NJ: John Wiley & Sons,
Inc.
Geology http://www.geologyin.com/2015/02/radiometric-dating.html
Betsabe Mullen
Betsabe Mullen posted Dec 27, 2019 11:06 PM
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Modern radiometric dating methods came into importance in the late 1940s and 1950s. These procedures
focus on the decay of atoms of one chemical element into another. They directed to the discovery
that certain very heavy elements could decay into lighter elements such as uranium decaying into
lead. This process became to be known as radiometric dating. The technique is based on a evaluation
between the measured amount of a naturally occurring radioactive element and its decay products,
assuming a constant rate of decay known as a half-life. Today, scientists use radiometric dating of
various sorts of rock both earthly and extraterrestrial to pinpoint Earth’s age. Taken together, these means
give results that suggest an age for our Earth, meteorites, the moon – and by inference our entire solar
system – of 4.5 to 4.6 billion years old.
For ancient rocks, a radioactive element with a very long half-life is needed. One such element is
samarium, which is current in minuscule amounts in most rocks and minerals. Radio-active
samarium transforms to neodymium with a half-life of 106 billion years
There are four different but interrelated units for measuring radioactivity, exposure, absorbed do se, and
dose equivalent.
Radioactivity is a part of our earth it has existed all along. Indeed, occurring radioactive materials are
present in its crust, the floors and walls of our homes, schools, or offices and in the food we eat and drink.
There are radioactive gases in the air we breathe. Within our own bodies - muscles, bones, and tissue contain naturally occurring radioactive elements.
References:
https://earthsky.org/earth/how-old-is-the-earth
https://www.google.com/search?sxsrf=ACYBGNTkBge7sF7PU8MA9WVgGQ95zVsXAg\%&uact=5
https://www.iaea.org/Publications/Factsheets/English/radlifesel
•
SC250 Discussion Requirements
Post a Main Post that answers all discussion questions in an original, well-thought-out manner. Make
frequent, informed references to this units material. Engage in on-going, productive conversation by
responding to a minimum of two classmates or your instructor per discussion topic. Your additional
posts should be thoughtful, thorough, and add new information to the discussion. Remember that we
will learn more by sharing ideas!
Please note: Material copied directly from references (quotes, summaries, or paraphrases) should
make up no more than 10\% of the total writing for all written Assignments in this course. All writing in
coursework must be your own original work and in your own words.
Be sure to provide appropriate citations, references, and links to any information you use in this
discussion. For help with APA citations, refer to the APA Quick Reference under Course Resources.
Refer to the DB Scoring Guide provided by your instructor for how you will be scored on the
discussion.
Tips for quality participation in the Discussion Board:
Ask a question or make a comment showing that you are interested in another persons post and
encouraging him or her to elaborate.
Post a resource (a reading, web link, video, quote, etc.) not covered in the syllabus but adding
new information or valuable perspectives to the learning.
Make a comment underscoring the link between two peoples posts and make this link explicit in
your comment.
Contribute something that builds on what someone else has posted. Be explicit about the way you
are building on the other persons thoughts.
Include your own experiences or ideas on the topic, supported with references when appropriate.
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