Lava plateaus is formed by highly fluid (runny) basaltic lava during numerous successive eruptions through numerous vents without violent explosions (quiet eruptions). These eruptions are quiet because of low vicosity are of mafic lava, so that it is very fluid and contains a small amount of trapped gases.
Well some can be the types of food they eat
Answer:
Water in this area may have been leftover from ancient times when saline seas occupied the western U.S., and, also, as rainfall infiltrates downward into the ground, it can encounter rocks that contain highly soluble minerals, which turn the water saline.
Sedimentary rock is the correct answer