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Volcanic eruptions are driven by both constructive and destructive forces, making the selection of both types as the correct answer essential to understanding volcanic activity. Constructive forces, such as the movement of tectonic plates, lead to the formation of new landforms and the addition of new material to the Earth's surface, as seen with the accumulation of lava and ash from eruptions.

Destructive forces also play a significant role, as they include the processes that can lead to the collapse of existing structures and landscapes due to volcanic activity. For instance, when a volcano erupts, it can cause significant damage to surrounding areas through lava flows, pyroclastic flows, and ash deposits.

The interplay between these forces illustrates the dynamic nature of Earth's geology, where eruptions not only create new land but can also reshape or destroy what already exists. Thus, recognizing both constructive and destructive forces is crucial for a comprehensive understanding of volcanic processes and their impacts.