Radiometric Dating Activity - PDF
Teacher Notes: Radiometric Dating Activity This hands-on activity is a simulation technique called radioactive dating allows scientists to determine the actual age of a fossil. 4) Geologists have made many radiometric age determinations, and .. Lesson Plan: GENOTYPE AND PHENOTYPE Pacing Two minute class. Significance: Archaeology allows us to find the fossils and remains that back up Definition: A theory developed by geologist Baron Cuvier (). Significance: Genotypes also effect behavior, which can be inherited at molecular level .. Scientists use radiometric dating- a technique that uses radioactive isotopes. Fossils. The idea that the same geologic processes shaping the earth today have been at work Helps to give clues to an animals diet and lifestyle. Relative age of rocks does not tell exact age; Can be determined using 2 different methods: Radioactive “Parent atoms” decay into “daughter atoms” at a predictable rate.
Through this simulation, they will gain an understanding of how scientists are able to use isotopes such as U and Pb to determine the age of ancient minerals.
National Science Education Standards: Mathematics is important in all aspects of scientific inquiry. Science and technology are reciprocal. Science helps drive technology, as it addresses questions that demand more sophisticated instruments and provides principles for better instrumentation and technique.
Technology is essential to science, because it provides instruments and techniques that enable observations of objects and phenomena that are otherwise unobservable due to factors such as quantity, distance, location, size, and speed. Technology also provides tools for investigations, inquiry, and analysis. Mathematics is essential in scientific inquiry.
What does radioactive dating enable geologists to determine?
Mathematical tools and models guide and improve the posing of questions, gathering data, constructing explanations and communicating results. Before class begins, prepare five bags filled with about beads each. For each bag, count a specific number of "parent isotope" beads of one color and "daughter isotope" beads of another color.
Once you have a set of parent and daughter isotope beads in the bag, fill up the bag with a mixture of all the other colors. Next, label each bag with a numberput it at a separate station around the room, and make a sign that identifies the parent isotope type and color, daughter isotope type and color, and half-life. For instance, your five bags might be set-up something like: The bags should be checked before use. The bag itself represents the fossil and the beads inside represent some of the millions of atoms that make it up.
As scientists, their job is to count the number of parent and daughter isotope atoms in each bag, and from this data to determine how many half-lives the isotope has gone through and therefore the age of the rock.
Have the students rotate in groups from station to station until they have figured out the age of all five fossils. Students will calculate the percent of remaining parent isotopes using the following equation. Instead of using exponents and natural logs, the students can just use a graph of predicted decay rates to determine the number of half-lives the isotope has gone through based on this percentage see graph.
For instance, in fossil one, the students will take 15 divided by 60 and come up with the percentage. In this way, they get practice reading graphs and using them to understand and interpret data. A good idea is to have the graph printed on the worksheet with the data table so that the students can have it right in front of them.
What does radioactive dating enable geologists to determine? | Socratic
Finally, to figure out the age of the fossil, they will take the number of half-lives, two in this case, and multiply it by the length of the half-life million years for fossil one: Determining a fossils age can be done in a couple of ways.
The first is relative dating. Scientists use relative dating to determine which fossils are older or younger. To understand how relative dating works imagine that a river has cut down through layers of sedimentary rock to form a canyon. If you look at the canyon walls, you can see the layers of sedimentary rock piled up one on top of another.
The layers near the top of the canyon were generally formed most recently and are the youngest rock layers. The lower down the canyon wall you go, the older the rock layers are. Fossils provide evidence of evolutionary change.
Mineralisation, freezing, dehydration and petrification in plants are processes which lead to fossilisation Age of fossils or rocks can be determined and is dependant on stratification. Absolute dating via radiometric dating assigns numerical data to the age. The Earth has changed significantly over millions of years and evidence suggests that it is still changing. World can be divided into 6 bio geographical regions which describe flora and fauna in a geographical area.
What you intend the students to learn about this idea. Environment needs to be wet but lacking in oxygen or Water or both for fossilisation to occur.
Radiometric Dating Activity
Calcium rich seabeds and sedimentary rocks are locations where fossils can be found. Never found volcanic rock because molten lava solidifies at degrees, which burns organic material. Geological time is divided into era, periods and epochs and animals and plants have been connected to these time periods.Radioactive Dating, Accurate or Not?
Flora and fauna that have evolved over time contribute to the composition of atmospheric substances namely oxygen.
Why it is important for students to know this. Fossils show us variations, which lead to different phenotypic characteristics required to survive in the associated area. Fossils which Stratification is the process of formation of layers of sedimentary rock which means material found in lower layers of rock is older and material found in upper layers is younger.