Final answer:
The starter rock for geology is B. Igneous rocks, which form from cooled magma or lava and are the original materials for the rock cycle. Sedimentary and metamorphic rocks are derived from igneous rocks through various geological processes.
Step-by-step explanation:
Starter Rock for Geology
The starter rock for geology is B. Igneous rocks. Igneous rocks are formed from the cooling and solidification of magma or lava. As these rocks cool, minerals begin to crystallize, interlocking with each other, ultimately forming an igneous rock. These are the original rocks from which sedimentary and metamorphic rocks can eventually form, through processes such as weathering, cementation, and metamorphism. Therefore, igneous rocks lay the foundational materials for the rock cycle in geology.
Sedimentary rocks, like sandstones and limestones, are derived from the accumulation and lithification of mineral and organic material, or from pre-existing igneous and metamorphic rocks that have been worn down into sediments. Metamorphic rocks, on the other hand, are created when existing igneous or sedimentary rocks are subjected to intense heat and pressure within the Earth's crust, causing them to physically and chemically transform.