Significant settlement in manitoba, saskatchewan, and alberta
a. was a response to the world demand for wheat in the early twentieth century.
b. occurred only after world war ii.
c. occurred only as major highways were built across canada.
d. followed the completion of canada's transcontinental railways

Followed the completion of Canada's transcontinental railwaysso d

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.