atmosphere biosphere and water cycle. ~ or
living organism | living organisms | organism | organism death | organisms
ocean | the ocean | the oceans | oceans
rocks | rock
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The three main layers of the earth are the Core, Mantle and Crust. The Core is mostly made from iron and nickel, the Crust from oxygen, silicon and aluminum and the mantle silicon,oxygen,iron and magnesium.
The word "carbohydrate" is made up of the names of three elements: carbon, hydrogen and oxygen. Which is the main one? Well, the hydrogen will outnumber the others but carbon is the backbone of these molecules, so you pick.
The Earth's water reservoirs from largest to smallest: Ocean Polar ice and Glaciers Groundwater Freshwater Lakes Saline Lakes Soil Moisture Atmosphere Rivers
Three main points.
The main function of the left side of the human heart is to get oxygen to the cells.