25 risk of a major tsunami along the coast of british columbia and the adjacent area of the united states exists because the juan de fuca plate is subducting the north american plate. compare the risk here with the situation in the indian ocean.

The plates in the north American ocean are different than what the plates in the indian ocean is

A,b,c is the answer to the question

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.