What is the most significant factor that controls the development of soil?
a. parent material
b. time
c. topography
d. climate

The answer is D. Climate

Warmer temperatures and abundance of water will have the tendency to speed up the soil development, in some cases speed up happened very dramatically . Cooler temperature will slowdown soil development.

Which why the best fruits and vegetables usually come from tropical area

Since wxyz is 4, halfof that would be 2.

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.