Which of the following may occur during metamorphism?
A. The rock becomes less compact.
B. Certain minerals may recrystallize.
C. Crystals may grow smaller.
D. The rock becomes less dense.
To determine which of the following may occur during metamorphism, we need to understand what metamorphism is. Metamorphism is the process by which pre-existing rocks are transformed into new rock types due to changes in temperature, pressure, and chemical environment. These changes can have various effects on the rock.
Let's evaluate each of the given options:
A. The rock becomes less compact: This is not typically a characteristic of metamorphism. Metamorphism generally involves an increase in rock density as the minerals within the rock recrystallize under high temperatures and pressures. Therefore, option A is unlikely.
B. Certain minerals may recrystallize: This is a characteristic of metamorphism. During metamorphism, existing minerals within the rock may recrystallize into new minerals, resulting in the formation of different rock textures and mineral compositions. So, option B is possible.
C. Crystals may grow smaller: This is generally not a characteristic of metamorphism. Metamorphic processes often involve the growth of new crystals or the rearrangement of existing crystals into larger grains. Therefore, option C is unlikely.
D. The rock becomes less dense: This is not typically a characteristic of metamorphism. As mentioned earlier, metamorphism usually leads to an increase in rock density due to the processes of mineral recrystallization and compaction. Consequently, option D is unlikely.
Based on the explanations above, the correct answer is option B: Certain minerals may recrystallize, which is a common occurrence during metamorphism.