Final answer:
The question is about the gerrymandering tactic called cracking, which dilutes the power of a political group by spreading them thinly across several districts, contrasting with packing, which concentrates them into a few districts.
Step-by-step explanation:
The strategy described in the student's question refers to gerrymandering, which is the manipulation of legislative district boundaries to favor one political group over another. The specific tactic mentioned for combining a smaller amount of GREEN voters with a larger amount of another group to dilute their power is known as cracking. This technique minimizes the ability of the cracked group to influence the outcome of elections across multiple districts. On the other hand, the tactic of concentrating the opposition into a few districts to minimize their overall power is known as packing. Both methods are used to create electoral advantages and can lead to elections that are less competitive and not truly representative of the population's political will.