Today we have done the lap work of volume density and mass and the thing that we did is we have stone with the sample numbers and we weight the stone after that we put it into the water that is 150 ml so the height of water in the beaker will higher than old we will measure how much it get more because of stone so we will know what is the stone volume in ml and then we find the stone density by use weight divided by volume and then make the table below this is the final step to finish the work.
Some people cut down trees and that make trees have less than before, so the world becomes hotter. Some of the factories create pollution that is very dangerous to people, for an example - is acid rain. Then in some country, they have many factories so they must use a lot more energy, so they developed themselves to have a factory that can create more energy - example, Japan, they make the nuclear factory and make nuclear power to make more energy for use. Nuclear power does not make a pollution to the air but another energy make so when people use the just Nuclear energy they won't make air pollution and this will make people that sick because of the air pollution decrease so people will more healthy and happier than before.