Final answer:
The Sierra Nevada's linear form is due to subduction processes forming granite batholiths, while the Basin and Range Province features multiple ranges due to extensional tectonics causing alternating horsts and grabens.
Step-by-step explanation:
The difference between the linear Sierra Nevada mountains and the multiple ranges of the Basin and Range Province can be attributed to their distinct geological formation processes. The Sierra Nevada is formed by the subduction of oceanic crust beneath the North American Plate, leading to the creation of massive granite batholiths, which, over time, have been exposed due to erosion. This subduction process gave rise to a linear range of mountains. In contrast, the Basin and Range Province is characterized by a series of normal faults created through extensional tectonics, resulting in alternating raised blocks (horsts) and lowered blocks (grabens). This extensional deformation leads to the formation of multiple linear mountain ranges separated by basins.