Question

the diagram below is a model of the rock cycle. the diagram shows how one type of rock can change into another type of rock.
select the magma.

Explanation:

In the rock cycle diagram, magma is represented by the volcanic eruption icon (the image of the volcano with the lava/eruption). This is because melting of rocks (igneous, sedimentary, metamorphic) produces magma, and crystallization of magma forms igneous rocks. The volcanic symbol is associated with magma (molten rock below or at the surface, with the volcano representing magma's connection to volcanic activity and rock formation via crystallization).

Answer:

The box with the volcano (the icon showing a volcano with the erupting/magma - related image) is the one representing magma.