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1) Salt
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Description
Salt is a resource that we often take for granted. Before refrigeration, people poured salt over meats to preserve them. Soldiers of the Roman Empire received their pay in salt. Even Christopher Columbus was on the hunt for salt when he landed in the New World. Salt is an essential element for life, too. Like water, our bodies need salt. The countries of North America have always had plentiful natural resources. But the exploitation of these resources...
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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...
3) 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....
4) 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...
5) 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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Water is one the most vital resources on the planet. Humans can live for weeks without food but only a few days without water. We cook with it, swim in it, and fish in it. Yet we humans often abuse water. We taint it with chemicals and human sewage. Water is more precious to us than gold, and yet we often waste it. As our population grows, there may not be enough freshwater to go around. The countries of North America have always had plentiful natural...
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The oceans, where life first began, occupy more than 70 percent of the Earth's surface. About half of the planet's 7 billion people live in close proximity to an ocean. We depend on them for food, energy, and recreation. Yet we know comparatively little about the oceans. One thing we do know, though, is that human activities are causing them harm. Although the oceans are immense, they are also in need of protection. The countries of North America...
8) Wild Weather
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Theme: Hi-lo, nonfiction, weather Weather happens every day. Sometimes it is wild. Hurricanes, tsunamis, and tornadoes are just some of the wild weather events in the world that have taken many lives and destroyed cities. Engage your most struggling readers in grades 4-7 with Red Rhino Nonfiction! This new series features high-interest topics in every content area. Visually appealing full-color photographs and illustrations, fun facts, and short chapters...
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