GEOLOGY

Detailed explanation-1: -Igneous rocks are divided into two groups, intrusive or extrusive, depending upon where the molten rock solidifies. Intrusive Igneous Rocks: Intrusive, or plutonic, igneous rock forms when magma is trapped deep inside the Earth. Great globs of molten rock rise toward the surface.

Detailed explanation-2: -These are called intrusive igneous rocks because the magma has intruded into pre-exiting rock layers. Types of intrusive igneous rocks are granite and basalt. The diagram above shows you a large intrusive igneous body called a batholith. A batholith is the largest of the intrusive bodies.

Detailed explanation-3: -Igneous rocks solidify from molten rock (called magma within the Earth and lava on the surface). They are identified by mineral content and texture-the size and shape of their mineral grains.

Detailed explanation-4: -When magma intrudes into a weakness like a crack or fissure and solidifies, the resulting cross-cutting feature is called a dike (sometimes spelled dyke). Because of this, dikes are often vertical or at an angle relative to the pre-existing rock layers that they intersect.

Detailed explanation-5: -Difference Between Batholith and Laccolith: Batholith occurs as individual igneous intrusive rock, while laccolith occurs as an intrusion in sedimentary rocks. Batholiths form when many plutons get together to form a granitic rock, and laccolith forms when high-pressure magma move the strata of sedimentary rocks.