Waste produced by agriculture, mining, households, industry and other human activities can end up in which of the following?*
A: Oceans
B:groundwater
C:streams and rivers
D:all of the above

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

just finished the test, the answer is d, greg is the least cost-effective because he charges the most for the project