9. What do Japan, Sweden, and Spain have in common? a. They are all ruled by dictators.
b. They are ruled by absolute monarchs.
C. They are all constitutional monarchies.
d. They have a federal system of government.

C,

Explanation:

Japan, Sweden, and Spain all have constitutional monarchies who have no real power in politics but rather act as a symbolic figurehead

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.

i'm sure the answer you are looking for would be

a. an ice age

hope this contact me if this didn't or you need with more answers : )