What is axial?
The rocks near the mid-ocean ridge at Axial Seamount are generally younger than those found in Oregon. This is because new oceanic crust is formed at the ridge through volcanic activity, resulting in younger rock formations. In contrast, the rocks in Oregon are part of the continental crust, which has been subjected to tectonic processes over a much longer geological time frame, making them older than the newly formed rocks at Axial.
Extrusion is older than intrusion because, an extrusion is always younger than the rocks below it. An intrusion is always younger than the rock layers around and beneath it. Hope the answers correct ;)
The principle you are referring to is the principle of cross-cutting relationships. It states that any feature that cuts across a rock must be younger than the rock it cuts across. This applies to intrusive rock bodies, which are younger than the rocks they intrude into.
One is not necessarily older than the other. It depends on the context. A fault running through any rock must be younger than that rock.
The law of superposition states: in horizontal rock layers, each layer is older than the one above it and younger than the one below it.
Intrusions of igneous rock are typically younger than the rock layers they penetrate. This is because the magma that forms igneous intrusions is usually injected after the surrounding rocks have already solidified and formed.
The fault is younger than rock layer A. This is because faults are fractures in the Earth's crust that form after the deposition of rock layers, and activities like faulting can occur long after the rock layers have been deposited and solidified.
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An intrusion is younger than its surrounding rock layers. An intrusion needs another rock to cut through it, which is referred to as a cross-cutting relationship.
principle of original horizontality
According to the principle of cross-cutting relationships, an intrusive rock body is younger than the rocks it intrudes into. This is because the intrusion must be younger in order to squeeze into the pre-existing rocks.