- How many substances are known to exsist on earth?

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The base of a triangle is 6 cm greater than the height the area is 20 cm squared find the height and the length of the base.? How do melting glaciers affect the flow of ocean currents? I really don't understand.? How would I write 5x - 2Y = 8 in function form? An explanation of how to get there would be huge.? What is the work function of nickel metal if light with = 1.22×10^15Hz is necessary to eject electrons? How does carbon enter the biosphere?