What is the primary mechanical advantage of a screw?

What well u can use to make a shelter but that's all I can think of ??

A screw is a mechanism that converts rotational motion to linear motion, and a torque (rotational force) to a linear force. It is one of the six classical simple machines. ... The smaller the pitch, the distance between the screw's threads, the greater themechanical advantage, the ratio of output to input force.

“when two plates carrying continents collide, the continental crust buckles and rocks pile up, creating towering mountain ranges. when an ocean plate collides with another ocean plate or with a plate carrying continents, one plate will bend and slide under the other. this process is called subduction. “ i found this on google i hope it