I really love skateboarding but ive recently broke my board, Do you skate? 
I do!  I've been skateboarding for years - I love riding and performing tricks!
Thats pretty sick. Im pretty curious about the history of skateboarding for my class project, Do you know when they were invented? 
It's not clear exactly when they were invented, but it was sometime in the 1940s or 50s. Initially skateboards were made of  wooden boxes and roller skate wheels!
Oh ok I figured they have been around for a while. Are the wheels on a skateboard made of rubber or plastic?
They are usually made from polyurethane.  Interestingly, skateboarding will be in the 2020 Olympic Games!