The Journey from solar energy to a geography textbook

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01/24/03 Suzana Zayed

The Journey from solar energy to a geography textbook

Many natural and synthetic resources go into the making a textbook. Since textbooks are made mostly of paper that in turn is made primarily of wood (biosphere), I will first consider the resources that help produce trees. A tree gets minerals (pedosphere) such as nitrate and phosphate salts from the soil, as well as from water (hydrosphere). The water also provides it with a solution in which salts can dissolve and are carried around the trees. Trees also need air (atmosphere) because it provides them with carbon dioxide that is essential for photosynthesis, the process during which plants produce their own food - glucose that can be stored as starch and used for growth. The energy source for this process is solar energy, which is derived from nuclear fusion in the sun.

Before trees are turned to paper, they need to be cut down. This is done by using tools such as axes or electric woodcutters made of steel and plastic for handles. It also uses oil for lubrications, fossil fuels such as diesel or petrol for running a motor.