How does light affect our world?

Which instrument is used to mearsure the heat? What is 1kg in newtons? What does sound travel best through? How many liters of water did elephant drink per day? What is 9.5 stone weight in kilos? If 35 percent of the fuel is converted into electricity this is called the what of the power plant? Water requires more energy than an equal mass of iron for its temperature to increase by a given amount because water has a greater? Does things sink in water if they have higher or lower densities than water? What is that heat escape lessening position designed to prevent? Who invented this machine and how heavy was it? What reacts with metal? The density of a submerged submarine is about the same as the density of? What is the inward force of the sun on the planets? Are electrostatic paint sprayers beneficial? What is the meting point of titanuim? What is free fall aceleration? Why is morning cooler then hotter in the afternoon? What are the part of pitch? What is carbon free electricity? Where would you end up if you could travel faster than light?

How does light affect our world?