According to the map above, which of the following statements about tornado frequency in Oklahoma is true? a. All Oklahoma counties are equally at risk for tornado activity.
b. Oklahoma has received more tornadoes since 1950 than in the previous 50 years.
c. No Oklahoma county has had more than 100 tornadoes since 1950.
d. Every county in Oklahoma has had at least 10 tornadoes since 1950.

D

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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.