The difference between relative and absolute dating
Students come in silently and complete the (attached) Do Now.After time expires (anywhere from 2-4 minutes depending on the type of Do Now and number of questions), we collectively go over the responses (usually involving a series of cold calls and/or volunteers), before I call on a student and ask them to read the objective out loud to start the lesson.As a general note, the Do Now serves a few purposes: After the Do Now, I show them a picture of the Obama family and give them a minute to discuss the question - "Can you sort all of the people in this picture from oldest to youngest?" After 30 - 60 seconds, we come back together and discuss, where I solicit a few responses.
Most of them are able to do this pretty easily, after which I ask "why? But in the discussion, I also mention that even though we know who is oldest, youngest, and their relative order, we don't know After the introduction, we take some time to whole group read over the brief text on relative/absolute dating.
" Oftentimes, students point to characteristics like size, clothing, facial structure, presence of wrinkles, etc. On the bottom of the first page of the Definitions & Text resource, they're given a profile of a rock layer, which I use to first talk about the idea of superposition - the concept that the bottom-most rock layers are oldest, while the youngest rock layers are found at the top (this Superposition Picture can also be used in class to illustrate the concept).
The difference between relative and absolute dating comments