Put an H next to the items that describe Human Systems
Put a P next to the items that describe Physical Systems.
canals
faults
floods
bridges

Respuesta :

Canals are man-made, meaning, they are Human Systems
Faults are natural, meaning, they are Physical Systems
Floods are not created by man, meaning, they are 
Physical Systems
Bridges are man-made, meaning, they are Human Systems

I hope this helps!