Describe a hypothetical scenario of natural selection for a trait. Be sure to describe each of the key elements (such as how the trait varies in the population, how the trait factors into resource competition, and how the trait frequency changes over multiple generations).

When volcanoes erupt, magma (hot, molten rock) rises toward the surface of the earth. as magma cools, solid rock forms. this rock contains substances from the interior of the earth. which of the following natural resources is likely to be plentiful near subduction zones where volcanic activity has occurred in the past?