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.
Plant onion plants as soon as possible after you receive them, as soon as the soil can be worked, before the last frost. Plant onion plants 1 inch deep, 5 â 6 inches apart, or 2 â 3 inches if you prefer to thin later for green onions or scallions. Water well.