5. a pacific mp air mass moving inland (eastward) and across the united states often produces conditions along the western slopes of mountain ranges it crosses.

a hot and humid
b dry and hot
c wet and unstable
d dry and stable

The correct answer is C. Wet and unestable

Explanation:

The mP Air mass type is characterized for being mild and humid and it is commonly formed to the North Pacific, in United States, because its high latitudes. When it moves inland (Eastward) cold air meets warm air provoking  unestable conditions in the atmosphere boosting the formation of clouds, and subsequently, precipitation. Then, when decending over the western slopes of mountain, it is moist and can produce rain and snow.

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.