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.
Fire Sprinkler Myth #3 â Fire sprinklers cause excessive water damage. While there is a definite risk of water damage from a fire sprinkler system, think about this â a fire hose can pump a minimum of 150 â 250 gallons of water into your home (some hoses can pump 1000 gallons of water per minute!).