Teaching about absolute dating black britain dating man
Certain isotopes are unstable and undergo a process of radioactive decay, slowly and steadily transforming, atom by atom, into a different isotope (giving off energy (heat) as a byproduct of this action).
This rate of decay is constant for a given isotope, and the time it takes for one-half of a particular isotope to decay is its radioactive half-life.
Summative Assessment The teacher should formally assess student's reflection questions completed in the of the lesson.
Students' answers to these questions should demonstrate the student's knowledge of relative and absolute age, as well as an understanding of the geologic time scale model created in the Teachers could identify students who require acceleration opportunities and appoint these students as group leaders for the collaborative timeline activity.
Curricular Concept: Students will construct models to demonstrate the relative size and distances from the sun for each of the 8 planets in the solar system.
Next, students will work with collaborative groups to order events in Earth's geologic history by relative age, then order those same events by absolute age in a scaled model timeline.
The students will find the scaled distance by dividing the absolute age of the organism by the corresponding scale factor (See attachments for teacher key.) Next, the students should find the organism to most recently exist and measure the scaled distance from the end of the paper marked "Today". [Using a scale factor of 1 millimeter=1 million years-100,000/1,000,000=0.1 mm] The students will measure 0.1 mm from the end of the paper marked "Today" and place the Absolute Age card for "First Modern Humans" at this location. The students will continue these steps for the remaining organisms until the oldest organism is placed on the timeline. [Using a scale factor of 1 meter=1 billion years-2,500,000,000/1,000,000,000=2.5 m] The students will measure 2.5 m from the end of the paper marked "Today" and place the Absolute Age card for "Bacteria" at this location.Note: This lesson was adapted using ideas and information from the following websites.The teacher can visit these websites for additional information about the lesson's content: 1.Lastly, students will use the time-scale model created with their group members to analyze events in Earth's geologic history.8 ) Develop a time scale model of Earth's biological and geological history to establish relative and absolute age of major events in Earth's history (e.g., radiometric dating, models of geologic cross sections, sedimentary layering, fossilization, early life forms, folding, faulting, igneous intrusions).Student Materials (per student)Pencil/pen"It's All Absolutely Relative" Handout (see attachments)"Geologic Time Scale Model Reflection Questions" Handout (see attachments)Student Materials (per group)Scissors Metric Ruler Glue or tape"Geologic Events-Life Forms Cards" (see attachments)4.6 meters of adding machine tape, toilet paper, or another material cut to the appropriate length "Geologic Events-Life Forms' Absolute Age Cards" (see attachments)Teacher Materials Geologic Events-Life Forms Absolute Age Cards Teacher Key (see attachments)Website for Acceleration Intervention Activities"Geologic Time" from the University of California Museum of Paleontology at Berkley According to most scientists, the Earth is approximately 4.6 billion years old.