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Since relative dating can easily be verified by superposition (the younger bed over the older one), intrusion (the intrusive being younger than the intrusive rock), and use of index fossils (younger fossils in a rock layer make that layer younger than another containing older fossils), relative dating can be confirmed right at the field using one's direct observation.It could also be immediately confirmed in the base office once maps and cross sections are updated and the rock units confirmed.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?

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Relative-age time periods are what make up the Geologic Time Scale.

In the science of geology, there are two main ways we use to describe how old a thing is or how long ago an event took place. When you say that I am 38 years old or that the dinosaurs died out 65 million years ago, or that the solar system formed 4.6 billion years ago, those are absolute ages.

There are absolute ages and there are relative ages. We use a variety of laboratory techniques to figure out absolute ages of rocks, often having to do with the known rates of decay of radioactive elements into detectable daughter products.

A few days ago, I wrote a post about the basins of the Moon -- a result of a trip down a rabbit hole of book research.

Here's the next step in that journey: the Geologic Time Scales of Earth and the Moon.

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