Concept:Batholiths are massive intrusive igneous bodies that form the deep root or core of many fold mountains.
Explanation:When fold mountains are being built, molten rock from beneath the Earth’s crust rises upward.
This molten rock cools and solidifies slowly deep underground, forming a huge granite mass called a batholith.
Over millions of years, softer rocks around the batholith are worn away by erosion.
As a result, the hard batholith remains and appears as the central root or core of the mountain range.
Features like dykes, sills, and lopoliths are also intrusive igneous rocks, but they are smaller and do not form the major foundation of fold mountains.
Answer:A. Batholith