Estimate the mass of water on the earth. The density of water is 1000kg cubic meter. Give answer to 1 significant figure. There are some approximations that can be use: compared with the oceans, lakes and rivers are tiny. Clouds have very low density. There is (still) lots of ice in the the polar regions , but much less area which covers roughly 2/3 of the earth. Looking at the charts of the oceans , we see that the depth is typically several thousand meters (and a serious search tells me the average depth is 4700m) .The radius of the earth is about 6000km .The surface area of a sphere is 4piR².

i think its according to my understanding here are some Estimate the mass of water on the earth. The density of water is 1000 kg. m approximations you can use: Compared with the oceans, lakes and rivers are tiny. Clouds have very low density. There is (still) lots of ice in the polar regions, but much less area than in the oceans. So neglect all except the oceans, which cover roughly 2/3 of the earth. Looking at charts of the oceans, we see that the depth is typically several thousand m (and a serious search tells me the average depth is 4700 m). The radius of the earth is about 6000 km. The surface area of a sphere is 47 R2. This is an order or magnitude question. Express your answer in kg, as a power of 10. For example, if you think the answer is 104 kg, enter 10^4.

a coal burning power plant

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force