Most stream valleys have a V shaped cross section because . A. water washing down the slope makes straight channels. B. vegetation on the slopes forces this profile. C. mass wasting of weathered rocks on the slope maintain an angle of repose slope. D. None of these

The answer is D because it erodes downward faster than water flowing in banks, so it cuts downwards.

"pacesetter of the south," comma inside the quotes

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.