When there are more sunspots the Sun is more active and there are more solar storms and more of the Sun's energy reaches the Earth. If Bob notices an increase in the amount of solar storms, it would mean there are more or less sunspots?
more
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Because richer nations use more fossil fuels, they also cause more air pollution and global warming than poorer nations do. Mona lives in a nation that uses a lot of fossil fuels. What would happen to her countries levels of air pollution if they were to decrease their usage increase or decrease?
decrease
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More advanced farming practices allowed a single farmer to grow food for many more people. Farmer Bill got an older machine to sift his wheat. This machine causes him to grow more or less food?
less
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If salt is added to a volume of water, there are more molecules in the same volume, so the water is denser. If Milo wants to make his water saltier and begins adding salt to the glass, what happens to the density of the glass of water decreases or increases?
increases
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