Check "cairn" for an extensive explanation of this activity and various meanings attributed to it.
This is a tradition and is done in norway when you visit a mountain and you like what you see - you make a stack out of some rocks stones or pebbles in the hope that one day you will return
the physical layer
Stack
A Grain of sugar
Yes
Stacking rocks on top of one another is generally referred to as "rock stacking" or "cairn building." This activity is often done for fun, as a way to mark a trail, or as a form of meditation or mindfulness practice.
I hate to be blunt, but the whole idea that Egyptians needed help from an advanced alien society, in order to stack rocks, comes from some wacko books from the Seventies, written by a racist who saw nothing unusual in white people being able to stack rocks without alien help (name one cathedral which any sane person thinks had to be built by aliens) but could not believe black and brown people could do so.
A stack referrs to a type of amplifier where there is a head, and two cabinets stacked atop one another. The head is on the top of both cabinets. A popular amp stack would be a marshall stack. The cabinets usually consist of 4 12 inch speakers but this can vary.
Rocks differ due to texture, hardness, color and shape.
A type of RAM that is organized as a stack. or part of RAM that has software to make it operate like a stack. A stack memory operates like one of those chip dispensers they use in Los Vegas. You push the chips onto the stack. When you remove one (called a pop), it was the one on the top, the last one you put in. The first one you put in is the last one you take out. They are used by certain types of computer hardware and software that needs data accessed in that way, FILO (first in last out) and LIFO (last in first out). For example subroutine return addresses. When the CPU executes a subroutine call, the return address is pushed on the stack. The subroutine may call another subroutine, with another return address pushed on the stack. And more. then when the subroutines are exited, the addresses are POPed off the stack and executed. The use of a stack ensures the returns are all executed in the correct order.
There are many different types of minerals and rocks and they are sometimes hard to distinguish one from another. Apatite rocks are usually transparent green.
Is called metamorphism.