The melted magma or partially melted rock rise or intrude the surrounding rocks because of the buoyancy. The partially melted rocks or magma due their high temperature become less dense than the surrounding rocks and rise up. And then these heated rock or magma react with surrounding rocks which in turn increases the pressure in the magma chamber. This intermixing of magma with surrounding rocks forms another type of rocks called igneous rocks.
Explanation: Metal detectors are inexpensive and easy to use equipment used to discover relics of the past. While it is useful in archaeology as a tool that discovers objects from the past quite easily, it is also a threat to archaeology. Some hobbyists and looters who come across archaeological finds which may be important to understanding past civilizations or a different era do not report these finds. Even worse, some looters knowingly infringe on archaeological sites and are aided by the metal detectors.
