Check this 6 minute video clip about Mesoamerica Geography.
Check this 21 minute clip titled "MesoAmerica: A History of Central America".
Check this 26 minute clip titled "National Geographic: Nations of the World - Central America".
We are on the unit about the Americas which is Chapters 11 and 12.
To see the Internet version of Chapter 11, lessons 1, 2 and 3, click on the icon to the left to take you to that web site.