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...

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....

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...

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...