__ is measured in meters.

Length

Explanation:

Length or Distance is measured in meters.

And meters is represented by;

m though kilometers can be used but meters is the standard one.

i believe you meant to say air rather than hair so the answer is below ")

the dead sea, the lowest place on earth at 430 metres (1,410 ft) below sea level, has a correspondingly high typical atmospheric pressure of 1065 hpa.

i think that d. wind is the answer.   i missed the question when i answered a. currents.