Millions of people around the world cook their food over a __________ every day. It is often difficult to find wood for the fire. People who do not have __________ must spend large amounts of money on cooking fuel. However, there is a much easier way to cook food using energy from the sun.
Solar cookers, or ovens, have been used for centuries. A Swiss scientist made the first solar oven in __________. Today, people are using solar cookers in many countries around the world. People use solar ovens to cook food and to __________ drinking water to kill __________ and other harmful organisms.
There are three kinds of solar ovens. The first is a box cooker. It is designed with a special wall that shines or reflects __________ into the box. Heat gets trapped under a piece of glass or plastic covering the top of the cooker. A box oven is effective for __________ cooking of large amounts of food.
The second kind of solar oven is a __________ cooker. It includes several flat walls, or panels, that directly reflect the sun’s light onto the food. The food is inside a __________ container of plastic or glass that traps heat energy. People can build panel cookers quickly and with very few supplies. They do not cost much. In Kenya, for example, panel cookers are being manufactured for just two dollars.
The third kind of solar oven is a __________ cooker. It has rounded walls that aim sunlight directly into the bottom of the oven. Food cooks quickly in parabolic ovens. However, these cookers are __________ to make. They must be re-aimed often to follow the sun. Parabolic cookers can also cause burns and eye __________ if they are not used correctly.
You can make solar ovens from boxes or heavy paper. They will not catch fire. Paper burns at two hundred thirty-two degrees Celsius. A solar cooker never gets that hot. Solar ovens cook food at low temperatures over long __________ of time. This permits people to __________ food to cook while they do other things.
You can learn more about solar cooking at solarcooking.org. Or write to Solar Cookers International. The postal address is nineteen nineteen Twenty-first Street, Sacramento, California, nine-five-eight-one-one, USA.