12a. How does the model of the volcano provide evidence for the cycling of Earth materials through the rock cycle? 12b. Explain how the process you described in 12a results in rock formation.​

lava is coming from the crust

Explanation:

volcano's explode with lava because the crust pushes it out

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.