Explains how fossil fuels are generated and used; discusses oil, gas, and coal; and considers the future of fossil fuels in relation to renewable energy sources.
Explains how the Earth produces heat that can be used at the surface, describes how people have used this geothermal heat over the years, and discusses it as a possible source of renewable energy.
Discusses ways of obtaining power from water by damming rivers or harnessing tides and ocean waves, and includes information on the history of hydropower and how it may be used in the future.
The secret world of insects revealed. Every fall, insects disappear. And every spring, they return. Where do they go? The dragonfly dies, leaving its young safe in the muddy bottom of a stream. The mo
The secret world of insects revealed. Every fall, insects disappear. And every spring, they return. Where do they go? The dragonfly dies, leaving its young safe in the muddy bottom of a stream. The mo
