Meteor Craters: How are they created?

This class we will investigate various websites and complete an measurement and location activity using Google Earth. You will locate 10 major craters on Earth's surface and measure their diameters.  Which one is the biggest?  How do their sizes compare?  Do they all look the same?  Which one is the oldest?  If you were to stand in them, how long would it take you to get to the other side?  How do the craters compare to those we see on the moon?  Extension:  How do scientists know which crater is older and the age of craters?  

Before you begin, have a look at these websites to get your thinking started...

http://www.meteorcrater.com/

http://www.wired.com/wiredscience/2009/08/impactcraters/all/1

How many craters do you think there are?  Have a look! 
http://geology.com/meteor-impact-craters.shtml

You will be using this website, but I have printed it for you to write on in class. 
http://supernova7.apsc.csi.cuny.edu/google_earth_impacts_worksheet%5B1%5D.pdf

To help you identify the craters when using Google Earth, you may need to use this link to help you. 
http://www.environmentalgraffiti.com/featured/10-greatest-major-impact-craters-on-earth/1403?image=0