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 To Apply. For most grasses, you will need to give them between 1 and 2 inches of water each week, according to Sunset magazine. This water should be given all at once to encourage the roots to grow deeply. For instance, if your oscillating sprinkler puts out 1 inch of water in an hour, water your lawn once a week for one hour. Test the soil with a soil sampling tube or probe to see if it is moistened 1 to 2 inches down after your initial watering.