Landscapes generally use wide angle and ultra wide angle lenses.
More often than not, yes, but it also depends on the scape you want to land:
A photograph is more than a bunch of pixels
|Sadiqur_Rahman by Sadiqur Rahman|
from Ain't Going to Work on Maggie's Farm no More
|Airborne by John Beavin|
from - How to respect the Flag and Anthem - (Portrait in Full Colours + A Border)