Numerical ages for boundaries between time units on the geologic time scale primarily resulted from the study of , in conjunction with relative age information determined from geologic principles.

Answer cumulus clouds;

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.

The answer is false,  hope my answer is : )