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Science Reference Center
Full-text articles to support research in applied sciences, biology, chemistry, earth and space science, and energy. Includes the Science Image Collection, a database of high-quality science images from National Geographic, UPI, Getty, NASA, and Nature Picture Library.
1) Iron
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If you put metals in a competition of strength, iron would come out on top. It works hard for us in the form of bridges, skyscrapers, and fences. Combine iron with carbon and you have steel, which can be used in creating buildings, tools, and even satellites. Some of the first iron on Earth even came from outer space on meteorites. Iron is definitely out of this world! The countries of North America have always had plentiful natural resources. But...
2) Copper
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Copper is one of the most plentiful and useful metals on Earth. Ancient warriors used it to forge weapons with deadly blades, and shipbuilders used it to cover the bottoms of boats. Today, you can find copper in the kitchen and in computers, too. Copper is mixed with other metals to create alloys like brass to make instruments such as the trumpet. It is even in our blood! The countries of North America have always had plentiful natural resources....
3) Uranium
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Uranium is a powerful resource, but it is also a mixed blessing. Uranium can light a town or power a submarine, but it can also destroy a city. Areas around a nuclear power plant, which uses uranium to create its energy, can become dead zones if the nuclear reaction becomes unstable. And yet nuclear power can also be one of the cleanest sources of energy. The countries of North America have always had plentiful natural resources. But the exploitation...
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As two of the rarest metals on Earth, gold and silver have amazed humans for centuries. People have searched the world for silver and gold, hoping to fill their pockets with the shiny metals. And yet during all of human history, only enough gold has been extracted to fill two Olympic-sized swimming pools. And not every aspect of the metals is pretty. Mining gold and silver comes with many environmental consequences. The countries of North America...
5) Coal
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Without coal, our lives would be profoundly different. Formed over millions of years, coal provides one-fifth of the energy we use today. But burning coal also produces more pollution and greenhouse gases than other energy sources, which contributes to the growing problem of climate change. In the future, it will be more important than ever to find ways to make coal a "cleaner" form of energy. The countries of North America have always had plentiful...
6) Oil
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We depend on oil for heat, light, and transportation. But did you know that plastics are made from oil? How about nail polish? Formed over millions of years from the remains of ancient life forms, oil and its by-products are huge parts of our daily lives. However, as a fossil fuel, oil creates pollution and contributes to the growing problem of climate change. The countries of North America have always had plentiful natural resources. But the exploitation...
7) Natural Gas
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Natural gas is an amazing source of energy and one of the cleaner forms of fossil fuels, meaning that it produces less pollution than other forms. Does your barbecue grill at home use a propane tank rather than charcoal? Does your stove cook with blue flames? These are forms of natural gas. However, natural gas still contributes to climate change, and fracking, a method of extracting natural gas from the ground, is highly controversial. The countries...
9) Salt
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Looks at salt in the countries of North America, examining its natural history, use, technology, environmental impact, and economic significance. --Publisher's descrption.
11) Renewable energy
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Most of our energy comes from fossil fuels, but eventually we will run out. We will not, however, run out of sunshine or wind or waves. The center of the Earth will always be extremely hot, and fuels like switchgrass and algae can easily be regrown. These types of renewable energy-solar, wind, water, geothermal, and biomass-have the potential to power a cleaner future. The countries of North America have always had plentiful natural resources. But...
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About 17 percent of the forests on Earth are located in North America. From 3,000-year-old sequoias to tiny saplings, trees provide homes for animals as well as products and recreation for humans. Whether you're interested in herbs or syrup, in hunting or camping, you'll find what you are looking for in the forest. The countries of North America have always had plentiful natural resources. But the exploitation of these resources comes at a cost, and...
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