Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Warm and humid temperature and moisture conditions describe an air mass that originates over the atlantic ocean near the equator.
Which temperature and moisture conditions describe an air mass that originates over the Atlantic Ocean near the equator?

Tornadoes can occur in any.
At what time of the year can tornadoes occur?

Efficiency equals the output power divided by the input power.

What equals the output power divided by the input power?