What is the independent variable for a dry ice experiment

Rocks, as they are compressed, begin forming mountains above the earth's surface when two continental plates converge. the continental crust increases in depth as the mountains grow above. the himalayan mountains formed at a convergent plate boundary in this manner. the rocks are smashed together causing them to due to the intense heat and pressure from the colliding plates and eventually forming rock. a) melt; igneous b) layer; sedimentary c) recrystallize; metamorphic d) melt into the earth's interior; metamorphic

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .