Which of the following changes is possible, given the schematic known as 'the rock cycle'?
1) All of these changes are possible
2) An igneous rock may be broken down by weathering and erosion, and its particles can be compacted or cemented together to form a sedimentary rock
3) An igneous rock may be buried, where it is subjected to a great deal of pressure and increased temperature, recrystallizing to form a metamorphic rock
4) Sedimentary rocks can melt to form magma
5) Magma may migrate to the surface of the Earth, where it may flow out of a volcano, forming an extrusive igneous rock