Earthquakes, Volcanoes and Tsunamis' explained for children grades 3 to 5. Learn what causes these events while spending time with our three main characters Bo, Nigel, and Tickle Annie. "Hello Earth students. Welcome to the world of the underworld. My name is Bo-Ric-A-Bo but you can call me Bo. I live here on earth, just like you do but I spend a lot of time IN the earth. That may take some explaining. You will see what I mean as we begin our travels. We have a long way to go and a lot to see as we explore our land. What does terra firma mean? Terra means ground, firma means firm. There is very little terra firma in the world. So we call our study 'terra non-firma'. I made that up!

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