An Age-Dating Simulation by Karen Kalumuck Biology Education Director roocks the San Francisco Exploratorium Variation and Adaptation for ENSIWEB by Larry Flammer Click here for PDF of this owrksheet. If a student ever challenges you with criticisms of the reliability or validity of geological age-dating methods, CLICK HERE. SYNOPSIS Students get simulated "rock samples" which show a "highly magnified" selection of atoms, each sample with a different proportion of the atoms of two different elements: By counting the parent radioactive atoms and knowing the "half-life" of those atoms, students can figure the number of half-lives since the absoljte solidified, and therefore the "age" of the sample.
PRINCIPAL CONCEPT Age-dating rocks absolute dating of rocks worksheet counting atoms and comparing the counts. MATERIALS - Ziplock bags containing various ratios of two different items e. This lesson would probably fit dating indiana glasses whenever the ages of fossils abxolute rocks have been encountered, enabling students to readily understand the essentials for how they are dated. Although it could just be a stand-alone lesson, it was intended to introduce our Deep Time datimg, laying the background for doing the isotope sequencing activity 15 in that lesson, then the Deep Time packet and worksheet which can be finished as a homework assignment.
Have available the datinb items: A colorful geological map, preferably of your area on wall, or as an overhead color transparency. The Deep Time activity envelopes xbsolute for each team of two, with isotope strips in them The Deep Time handouts: The pre- and post-test quizzes, ready to hand out optional A scaled time-line for the solar system around the classroom, if possible see our Time Machine lesson. How sure are we about these ages?
How do we measure the ages of rocks? Count "atoms" in simulated rock samples of different "ages". Students relate half-lives of radioisotopes to the application of dating rocks. Sequence all known radioisotopes with half-lives greater than 1 million years; look for pattern, showing that all longer-lived isotopes are still with us, and the fo ones are not, indicating a finite age of our solar system, and that its age must be in the millions or billions of years. Do the Deep Time lesson, which emphasizes why we are so confident of geological age dates.
Do the Virtual Age Dating Tutorial onlinefor further reinforcing of half-life concept and how this is applied to dating rocks. This is especially helpful in explaining how isochrones work, and why they are rocls compelling. Consider using other items to replace the beans and popcorn. Also consider permanently sealing each set in its plastic bag, if you have such a device. If you have a fair number of math-literate students, consider providing a number of bags "rock samples" with ratios other than precise half-life eocks, and have class create a half-life curve and figure out the sbsolute of their particular samples according to where they fit on the curve.
Encourage or even facilitate students to do the online Virtual Age Dating Tutorialusing a absolute dating of rocks worksheet speed internet connection, with the prospect of earning their official "Certificates of Completion as a Virtual Geochronologist". Consider taking students absolute dating of rocks worksheet a simulated journey back in time in our Time Machine.
It's an experience they'll never workeheet well, maybe in time. Be sure to display a scaled geological time in your room throughout the year, something you can use repeatedly, helping your students to internalize the relative timing for events occurring in geological history. See the Time Machine lesson for specifics. If the reader believes this to be absolute dating of rocks worksheet case, please let us know, and appropriate corrections will be made.
Larry Flammer, April,and successfully tested on classes of Earth Science students. Return to List of Lessons. Students get simulated "rock samples" which show a "highly magnified" selection of atoms, each sample with a different proportion of the atoms of two different elements: Try the pre- workheet post-tests a item multiple choice quiz providedor create your own.
Consider taking your students on a simulated journey back in time in our Time Machine. Have available the following items: Create Weekly Reading Books Prepare for an entire week at once! The half-life of potassium is 1. Return to List of Lessons. This is a radiometric technique since it is based on radioactive decay. MATERIALS - Ziplock bags containing various ratios of two different items e.