Which of these practices does the most to keep wind and water from Carrying away topsoil?

the answer would be no-till farming

Explanation:

when the soil is compacted and naturally embedded into the ground the wind wont be able to throw it around and the water would be unable to wash away the seeds and or crops. hope this helps if you wanted to know why

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.