Science Olympiad Dynamic Planet Practice Test

What is a volcanic neck?

1. A winter formation of volcanic ice

2. A solidified lava that remains after volcanic material has eroded away

3. A hole formed at the top of a volcano

4. A size classification of volcanoes

The correct answer is: A solidified lava that remains after volcanic material has eroded away

A volcanic neck is formed when magma from within a volcano solidifies in the conduit or vent that connected to the surface. Over time, the surrounding volcanic material and softer rock are eroded away by natural forces, leaving the more resistant solidified lava exposed. This structure resembles a steep, often vertical column, which is why it can be referred to as a "neck." This phenomenon illustrates the process of erosion and how it shapes geological features, highlighting the contrast between the durability of the cooled lava and the more easily worn away volcanic material. Understanding volcanic necks helps to provide insights into the geological history of a region and the processes that shape the landscape over time.