Less than 20 percent of Earth's magma extruded through volcanism occurs at oceanic spreading centers. Group startsTrue or False

Answer

True.

Explanation

Less than 20 percent of the Earth's magma that is extruded through volcanic activity occurs at oceanic spreading centers. Oceanic spreading centers, also known as mid-ocean ridges, are locations where tectonic plates are moving apart, allowing magma to rise from the mantle to fill the gap. While these locations are significant for the creation of new oceanic crust, they represent a smaller fraction of the total volcanic activity on Earth when compared to subduction zones and other volcanic settings.

In contrast, the vast majority of volcanic activity occurs in subduction zones, where one tectonic plate is forced below another, leading to intense magma generation and the formation of volcanic arcs. This means that even though oceanic spreading centers contribute to the overall volcanic output, their contribution is relatively minor, accounting for less than 20% of the total extruded magma on our planet.