2) features of the ocean floor; 3) the concept of sea-floor spreading; and. 4) the nature of the Earth's magnetic field and the fact that it has reversed its polarity many times in the past. The Earth's layers â The Earth is a layered planet consisting of crust, mantle and core (Fig. 1).
Run your sprinklers for 15 minutes. Use a ruler to measure the depth of water in each can. Add all the numbers, and then divide by the number of cans to find the average output. This average number is your sprinkler number. It is the average amount of water your sprinklers apply in 15 minutes.
How much: 0.156 gallon/day (TABLE) X 300 feetÂ² = 46.8 gallons/day. How often: everyday, 46.8 divided by 4 emitters = 11.7 hours. Every other day = 23.4 hours. For sprinkler irrigation: water is not applied daily, but on a periodic basis to fill the soil, which acts.