Is this reaction oxidation or reduction
CH2=CH2 + OsO4 yields to HOCH2CH2OH

Iwll give extra points to who gets this for ! what type of reaction is this? ?

Ineed to find the answer of this question because i dont understand it

If oil spills continue, all of the following should be expected except (2 points) death of aquatic life. polluted groundwater. decreased soil productivity. increased global temperatures.