How are winds produced?

Say true/false: "Trade winds are produced due to conduction"

How are winds useful in our life?

How is sound produced and how is it transmitted and heard by us?

How do winds occur?

What wind speed would produce the same wind chill using the 1939 ormula as the wind chill produced using the 2001 formula when the outside temperture is 0^(@)F and the wind speed is 40 miles per hour ?