In sea floor spreading molten material rises from the mantel and erupts to where ?

The crust? I'm not sure I understand your question though.

Answeris associated with sunny,dry weather;

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.