Final answer:
Plutons can form a batholith through d. magma intrusion, a geological process of the slow cooling of magma within the Earth's crust, distinct from erosion, volcanic activity, and subduction.
Step-by-step explanation:
Plutons may amass into a batholith through the process of d. magma intrusion. Batholiths are large bodies of igneous rock formed from cooled magma deep within the Earth's crust. The formation of a batholith is a geological activity that typically involves the injection and solidification of magma in the crust over millions of years.
This process is not directly associated with erosion, volcanic activity, or subduction in the context of forming a batholith. Instead, it primarily involves the slow cooling of massive amounts of magma that intrude into surrounding rock, crystallizing deep underground to form a large, coherent igneous body. With continued erosion of the overlying rock, the batholith eventually can be exposed at the Earth's surface.
Our planet's geology is significantly influenced by plate tectonics, leading to various geological activities such as rift zones, subduction zones, and volcanic eruptions which contribute to the dynamic nature of Earth's surface. While subduction zones are key in forming magmas, the accumulation of plutons to form a batholith is mostly associated with the cooling and solidification of magma that has already ascended through the crust as a result of such tectonic activities.