Any don't matter
It is alright for the surface of the ramp but not for the structure of the ramp.
yes
Me you dumb jackass
mega ramp
Concrete has a lot of creases and bumps and the wooden ramp is smooth
Yes, i do want to build a ramp for skateboarding
concrete
This is called a half pipe.
That would be pretty hard to do. You would have to have a seriously powerful rocket propelled skateboard and a space suit to do something like going to the moon on a ramp and skateboard. Please don't try it. That probably wouldn't end so well for either of us.
Because you took way to much acid.
Skateboarding originated in empty pools and then went to ramps.