In order to produce hydroelectric power, they pump water up to the top of a mountain, and as gravity causes the water flow down again, it is used to turn the turbines. If it requires an input of energy to pump water up the mountain, why do they use this process? *
Link to the article https://thinkprogress. org/the-inside story-of-the-worlds-biggest-battery -and-the-future-of-renewable-energy -8984c81283c/

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

the atomic mass is the bottom number on the element.

-steel jelly

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

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