Part A Below are some intrusive volcanic features that vary in size and shape th

Question

Part A

Below are some intrusive volcanic features that vary in size and shape that have been infused into host rocks. You will carefully examine their characteristics and identify the respective features. The top image shows the formation of these features and the two images below are the resulting features that evolved over time.

In this image, "Time" is indicated by the red arrows. It progresses from top to bottom.

Drag the appropriate labels to their respective targets.

Volcanic eruptions Sedimentary rocks rocks Magma chamber Volcanic neck shallow level Dike Sill Er dee n to Batholith Time Submit Previous Answers Correct

Explanation / Answer

Intrusive volcanic features

These features formed when magma cools and solidify inside the earth

Dike : When magma enters into the fracture of a pre-existing rock body solidifies into a sheet of rock then it is called a dike.

Sill : When magma enters between the preexisting sedimentary rock, tuff or metamorphic rock and solidifies then it is called as a Sill.

Both dike and sill are the intruded feature in pre-existing rock body but there is a difference in their position of crystallisation. Dikes cuts across the rock mass and solidify whereas Sill is a tabular sheet of rock which intrudes along the rock body and solidifies.

In the second diagram, the thin lines which are across the sedimentary rock are the examples of the dike and the sheets which are along the rock body are the examples of Sill.

Batholith : When a large mass of magma cools and solidifies deep inside the earth crust then it is termed as a Batholith. As it is formed through a slow cooling process that is why the crystals are large in size.

In the third diagram, it can be seen that due to excessive erosion over time the batholith which once formed deep inside the crust now become exposed to the earth surface.

Volcanic neck : When magma solidifies inside the mouth or the vent of an active volcano then it is called a or volcanic neck or plug. A plug can be the cause of an explosive eruption.

In the second diagram, we can clearly see the vent of a volcano which is a volcanic neck.

Sedimentary Rock : When the minerals and the organic particles get deposited and cemented over time on the ocean floor the sedimentary rocks formed. As the name suggests here the rock layers get sedimented one above another so the layering is the main characteristics of this rock.

In the first diagram, we can see some layers of the rock body which is labeled as sedimentary rock.

Hope this will help you.

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