Air column: space within the percussion instrument that determines the pitch. Percussion: sounds produced by striking the instrument with a mallet or stick, or striking one instrument against another. 2. Review the process of forming a hypothesis and making a prediction.
Dig short, shallow rows. The rows should be no more than 1/2 inch (1.5 centimeters) deep and spaced 4 inches (10 centimeters) to 6 inches (15 centimeters) apart. 3. Drop the seeds into the rows. Space the seeds approximately 1 inch (25 millimeters) apart in order to allow the onions enough room to grow and mature.
If you want the onions to grow to maturity, space them 4 apart. If you prefer to harvest some earlier as green onions, space them 2 apart and pull every other onion during the growing season, leaving the rest to grow to maturity. When planting several rows of onions, leave 16 between the outside edge of one bed, and the outside edge of the next.