What is thick, dark oil found under the earth's surface?

What are materials that comes directly from nature?

Land that is good for planting crops called _____.

The process of removing salt from water is called _______.

If water is polluted by oil it has been what?

What is it called when water is supplied to farmland?

What are non-renewable resources formed over millions of years?

What is it called when people move to the city?

What do you do when you show or represent something?

What is it called when you make changes?

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