Question 60

Heat and pressure

The description that the student should place on arrow B is "Heat and pressure," which accurately reflects the geological processes involved in the formation of metamorphic rocks.

A) Uplift and compression

This option is incorrect as "uplift and compression" refer to different geological processes. Uplift typically relates to the movement of the Earth's crust, while compression involves the squeezing of rocks, which does not encompass the thermal and pressure conditions needed for metamorphism.

B) Melting and cooling

"Melting and cooling" describes the processes associated with igneous rock formation rather than metamorphic processes. While melting occurs when rocks are subjected to extreme heat, it does not relate to the transformation of existing rocks under heat and pressure.

C) Erosion and deposition

This choice is also incorrect as "erosion and deposition" pertain to the processes that shape landscapes and the formation of sedimentary rocks. These processes do not involve the heat and pressure conditions that characterize metamorphism.

D) Heat and pressure

This is the correct option as it directly relates to the processes that transform existing rocks into metamorphic rocks. Heat and pressure cause changes in mineral structure and composition, making it essential for the metamorphic process.

Conclusion

The correct answer, "Heat and pressure," is definitively right as it directly correlates with the metamorphic processes of rock formation. All other options fail to represent the necessary geological conditions that lead to metamorphism, highlighting why they are unsuitable descriptions for arrow B.