What is providing water for crops?

What is the layer of undersground rock where water gets trapped?

What is contamination of water, soil, or air by chemicals or waste materials?

What is one of the most important and valuable fossil fuels?

What is the presence of unwhanted materials?

What is electricity produced by falling water?

What is an area that is blocked to collect water?

What is an area of land surrounded by land with no access to water?

What is to discuss in order to come to an agreement?

What is the the name of the organization founded to set oil prices and policies?

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