Final answer:
True, Iceland's location on the Mid-Atlantic Ridge and over a mantle plume makes it the site of significant tectonic activity, leading to frequent volcanic occurrences and the creation of new crust material option (a).
Step-by-step explanation:
The statement that The island of Iceland is a combination of a mid-oceanic ridge and a mantle plume is true. Iceland is geologically unique because it is located both on the Mid-Atlantic Ridge, which is an underwater mountain and rift system formed by the movement of the North American and Eurasian tectonic plates, and atop a deep mantle plume, which provides an additional source of volcanic activity beyond the spreading ridge.
The presence of the rift in Iceland allows for the observation of geological processes that usually occur at the bottom of oceans, such as the creation of new crust as molten rock rises to fill the space left by separating plates.
This geological setting is responsible for the island's high levels of volcanic activity and is also evidenced by phenomena such as reversals in rock magnetization, which provide a record of the Earth's historical magnetic field.