The more efficient a device is, the greater the percentage of usable energy it produces. If a device were to become less efficient, it would produce more or less usable energy?
less

Smaller sediments are dropped as the slope becomes less steep. Dan is watching sand fall down a small hill. The pieces of sand will be very large or small?
small

Because richer nations use more fossil fuels, they also cause more air pollution and global warming than poorer nations do. Amy is from the USA, where she used lots of fossil fuels. Andy is from a poor country where there are few fossil fuels to be used. The person who's country will contribute more to air pollution is Amy's or Andy's?
Amy's

Bases have pH values above 7. The higher the pH value, the more strongly basic the substance. If we tested a substance and the number was high on a pH test then the item is acidic or basic?
basic