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because harmful substances often chemicals or microorganisms contaminate a stream, river, lake, ocean, aquifer, or other body of water, degrading water quality and rendering it toxic to humans or the environment.
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Hope This Helps!!!
As far as a threat, North Korea has been seen as such for many years (since WWII), when North Korea sided with Russia. America and its Capitalism were not fond of the Communist party, and so we have really been fighting/being concerned about Russian influence.
Historically North and South Korea have been in conflict many years before America and Russia got involved. When we did though it got worse.
Trump has done very little to resolve this, some would say he is making it worse.
AND as for any current events ask Google!
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great oil reserves that encourage economic activities such as oil pro- duction. ... Agriculture plays a smaller role in many countries, such ... leum or natural gas—to make fertilizers, medi- ... duction are important in both Southwest Asia and ... on the earth, producing an even greater strain on water resources
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