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2. Hard water - Wikipedia

   en.wikipedia.org/wiki/Hard_water

   Wherever water hardness is a concern, water softening is commonly used to reduce hard water's adverse effects. Origins [ edit ] Natural rainwater, snow and other forms of precipitation typically have low concentrations of divalent cations such as calcium and magnesium.

3. Mariana Trench - Wikipedia

   en.wikipedia.org/wiki/Mariana_Trench

   The Mariana Trench is an oceanic trench located in the western Pacific Ocean, about 200 kilometres (124 mi) east of the Mariana Islands; it is the deepest oceanic trench on Earth. It is crescent-shaped and measures about 2,550 km (1,580 mi) in length and 69 km (43 mi) in width. The maximum known depth is 10,984 ± 25 metres (36,037 ± 82 ft ...

4. Marana, Arizona - Wikipedia

   en.wikipedia.org/wiki/Marana,_Arizona

   Marana (/ m ə ˈ r æ. n ə /) is a town that mostly lies in Pima County with a small portion in Pinal County, in the U.S. state of Arizona. [2] [3] It is located northwest of Tucson , Arizona. As of the 2020 census , the population of the town was 51,908.

5. Hard Water and Soft Water: Differences, Advantages, and ...

   www.healthline.com/health/hard-water-and-soft-water

   The hardness of water is determined primarily by the amount of calcium and magnesium it contains. Higher levels of these and other minerals make water hard. Water softening systems work by ...

6. Understanding Water: What Makes Water Hard or Soft? - WebMD

   www.webmd.com/.../difference-between-hard-soft-water

   The hardness or softness of water is determined by the mineral content of both calcium and magnesium : Soft water has less than 17 parts per million. Slightly hard water has 17 to 60 parts per ...

7. Tap Water: How Do I Know if it's Safe to Drink? - WebMD

   www.webmd.com/.../features/is-my-tap-water-safe

   You can tell if your water is hard or soft by measuring the calcium and magnesium content : Water is soft if it has 17 parts calcium and magnesium per million or less. Water is slightly hard if it ...

8. What Is the Healthiest Water To Drink?

   www.healthline.com/nutrition/what-is-the...

   The pH refers to the acidity or alkalinity of a liquid. A pH of 7 is considered neutral, a lower pH is more acidic, and a higher pH is more alkaline. Most drinking water has a neutral pH of 6.5 to ...

9. Maharana Pratap Sagar - Wikipedia

   en.wikipedia.org/wiki/Maharana_Pratap_Sagar

   Maharana Pratap Sagar, also known as Pong Reservoir or Pong Dam Lake is a large reservoir in Fatehpur, Jawali and Dehra tehsil of Kangra district of the state of Himachal Pradesh in India. It was created in 1975, by building the highest earthfill dam in India on the Beas River in the wetland zone of the Siwalik Hills.