Other chickens walk around the bale browsing around the edges of the bale, and eating the alfalfa flakes that get scratched off onto the ground by the upper chickens. Alfalfa is a very nutritious food crop. Alfalfa sends it's roots deep into the soil.
Soil or Waste Stacks. A soil or waste stack (normally just called a stack) is a drainage pipe that passes through at least one story(floor to ceiling) as a drain pipe, this also includes any horizontal offsets. Every soil or waste stack will terminate in a stack vent that leads to outside air or a vent header.
Stack is a last-in, first-out (LIFO) data structure. i.e. the element added last to the stack will be the one to be removed first. Typical use cases of stacks include:- (1) During debugging it is quite common to examine the function call stack during panics. (2) In RTOS like Symbian there are concepts like cleanup stack to avoid memory leaks. Some of the common terminology associated with stacks include PUSH, POP and TOP of the stack.