According to the earth science reference tables at which of these latitudes would average annual precipitation be greatest

It would probably be greatest within the tropical zone or 16 degrees north to 16 degrees south of the equator due to the torrential rains that occur in the rainy season although this would be balanced out somewhat by the dry season.

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.