Metallic minerals become concentrated in liquid magma because they

Metallic minerals become concentrated in liquid magma because they undergo igneous and hydrothermal processes.

Explanation:

The magma that is formed deep beneath the 'surface of the Earth' carries various earth minerals to the surface of the Earth through convective actions. It is responsible for the melting of solid minerals in the interiors of Earth. The minerals as a result of melting, liquify and reach the levels where their density allows them to float. This results in the concentration of minerals in liquid magma.

The scientist can conclude that there is a decrease in the natural resources due to human activities. because of innovation and modernization of the environment, then there goes pollution and other bad effects that destroys the natural resources.