GENERAL GEOLOGY

Detailed explanation-1: -A mass of igneous rock below the surface is called an Intrusion . It is always younger than the rock layers around and beneath it. A fault is a break in the Earth’s crust. A fault is always younger than the rock it cuts through.

Detailed explanation-2: -The principle of cross-cutting relationships states that a fault or intrusion is younger than the rocks that it cuts.

Detailed explanation-3: -What are intrusions? An intrusion is a body of igneous (created under intense heat) rock that has crystallized from molten magma. Gravity influences the placement of igneous rocks because it acts on the density differences between the magma and the surrounding wall rocks (country or local rocks).

Detailed explanation-4: -In geology, when an igneous intrusion cuts across a formation of sedimentary rock, it can be determined that the igneous intrusion is younger than the sedimentary rock.

Detailed explanation-5: -Intrusion A is younger than fault 10 because the Intrusion A is in one piece and did not moved unlike the layers in fault 10.