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.
1 If you get Â¾ to 1 inch of rain in a week, you can skip your next lawn watering. 2  If you have an automatic sprinkler system, attach a rain sensor or moisture sensor shutoff device. 3  Use a rain barrel to collect rainfall and runoff from downspouts. 4  Use the rainwater to water container plants and gardens. Measure Your Sprinkler Output Without knowing it, you could easily drop up to 300 gallons of water in one hour and end up over-watering your lawn. 2  Hereâs how to test your sprinkler output so you can adjust your watering time: 3  Place six to eight shallow, flat-bottomed cans at scattered locations around your lawn.