What is a common characteristic of most igneous and metamorphic rocks regarding voids?

Igneous and metamorphic rocks often contain fractures that create voids within their structure. These fractures can occur due to a variety of geological processes, including the cooling and solidification of molten rock in the case of igneous formations, or the intense heat and pressure that metamorphic rocks are subjected to. The presence of these fractures is important as they can influence properties such as permeability and stability, potentially impacting water movement and mineral distribution within the rock.

In contrast to the chosen answer, the other options do not accurately reflect common characteristics of igneous and metamorphic rocks. For instance, significant voids between grains are more characteristic of sedimentary rocks where sediment accumulation occurs, rather than tightly bound igneous and metamorphic varieties. The concept of loose particle connectivity does not apply to the crystallized or tightly interlocked grain structures found in these rock types. Lastly, while organic materials are essential components of certain sedimentary rocks, igneous and metamorphic rocks are primarily composed of silicate minerals and do not consist of organic materials, steering this characteristic away from igneous and metamorphic formations.