Yesterday, we launched our newest interactive--Smart House, a game that teaches players about energy efficiency and tests personal energy awareness.

Did you know that hydraulic fracturing has been used in about one million oil and natural gas wells in the United States? This tried-and-true process injects wells with water, small amounts of chemicals and sand to create tiny cracks in hard rock, allowing natural gas and/or oil to flow up the wellbore. Fracking, as it's often called, occurs thousands of feet below aquifers containing fresh water, and water supplies are protected by state well construction and drilling regulations.

You probably know that the oil and natural gas industry is one of the world's largest industries and that its revenues are significant. But did you know that the costs of providing consumers with the energy they need are massive as well?

Did you know that the laws of supply and demand have a huge impact on energy costs?

As the Associated Press reported on Aug. 27, the price of natural gas fell to its lowest level in seven years last week after the Energy Information Administration reported that underground storage areas are filling up. In trading last Thursday, natural gas prices dropped to as low as $2.692 per 1,000 cubic feet--the lowest price since August 7, 2002.

Did you know that today is National 811 Day? It's a date set aside by the Common Ground Alliance (CGA) to promote awareness of underground utilities through the use of the nationwide "811" call-in number for individuals, companies and governments preparing to dig.

And in Georgia, Colonial Pipeline has finished painting a set of its giant storage tanks with the "811 - Call Before You Dig" emblem as part of its efforts to prevent damage to underground utilities.

Here's an interesting factoid for you: America's reliance on imported oil has been falling. According to API's Monthly Statistical Report for June, imports fell 7.6 percent during the first half of 2009 as compared with the same period a year earlier. This drop was on top of two consecutive annual declines in crude oil and oil product imports in 2007 and 2008.

Over the last few days, we've asked you a number of energy-related questions about topics such as energy demand, supply, taxes and oil company ownership. Now it's truly time to put your knowledge to the test:

What's Your Energy IQ? You can use the widget below to answer all the survey questions, and you can watch the Energy IQ videos to see how other people answered the questions.

When oil companies do well, who benefits? Is it solely the companies' management? Or do average investors benefit as well? Consider this question:

What percent of U.S. oil companies' stocks are owned by corporate management?

The oil and natural gas industry makes many important contributions to the U.S. economy, but specifically:

How much do oil companies pay in income taxes as a share of their income?

Oil and natural gas are found all over the world in varying amounts, and throughout history, about one trillion barrels of oil have been produced. While about one-third of our oil is produced domestically, where does our imported oil come from?

Consider this Energy IQ survey question:

In 2008, which of the following countries was the largest U.S. supplier of imported oil?