When a volcanic eruption occurs at the surface, would the magma move through the crust to form a dyke or a sill? Explain your answer.

Answer 1

Some help from Internet:

Dykes are ingenous rocks that invade vertically w sills are the similar rocks that cut horizontally in rock form. Dykes are divergently invade while sills are clear intrusion. Dykes form when the point of origin is beneath while sills are formed when starting point is either on the left or right side.

Answer 2

To the sill

Answer 3

or dyke to form, the magma must first have enough pressure and force to break through the existing rock layers. This happens when the magma chamber deep within the earth builds up enough pressure to push the magma upward.

Whether a dyke or a sill is formed depends on the orientation of the cracks or existing rock layers that the magma encounters as it moves through the crust. A dyke forms when the magma cuts directly through the existing rock layers and moves vertically upwards towards the surface.

A sill, on the other hand, forms when the magma moves between the existing rock layers and spreads horizontally. This happens when the magma encounters a layer of rock that is weaker than the ones above and below it, and it can move through a crack in that layer.

So, whether a dyke or a sill forms depends on the direction of the magma's movement and the orientation of the layers of rock it encounters along the way.