North America
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Rapid growth of algae in lakes often due to the amount of run off high in phosphates and nitrogen from farms and lawns.

A tectonic plate boundary that runs from Vancouver Island to Northern California.

Narrow finger-like lakes formed by glacial action. Good examples are found in Finger Lakes region in New York State.

The use of violence to destroy a city.

Injecting liquids at high pressure into underground rock formations to extract oil and gas.

The region stretching from California to Florida associates with arm weather, bright sunshine and economic growth.

The region of the North East and Midwest associated with declining manufacturing sector. Also sometimes known as the Frostbelt.

Glacial deposits of rock and sediment.

A straight linedm heavy wind storm that can develop and move quickly.

A trade union between Canada, Mexico and the USA.

A country in which the city and the state are essentially one and the same.

An area where waters drains from and flows into a river or a number of tributaries.

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