Calculate Suppose that on each of the 4,500 dives Alvin has made, a new pilot and two new scientists were on board. How many scientists have seen the deep ocean through Alvin’s windows? How many people, in total, traveled in Alvin?

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crop rotation kepy different plants in the soil instead of once constintly. when switching out plants you have different nutrients being absorbed at different speeds and different roots growing differently therfore the spoil and water flow have to adapt and carry fresh nutrients to carry the constant changes that were going on in the soil.

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )