Earthâs crust is made of rock, and rock is made of natural substances called MINERALS. There are three main types of rockâsedimentary, igneous, and metamorphic rock. Each type is produced in different ways.The oldest rocks on Earth were formed about 3.8 billion years ago.arthâs crust is made of rock, and rock is made of natural substances called MINERALS. There are three main types of rockâsedimentary, igneous, and metamorphic rock. Each type is produced in different ways.
The first step to energy efficiency in your kitchen is to consider your appliances, and appliances with the ENERGY STARÂ® seal of approval are always the most energy efficient. Convection ovens also make a difference. The heated air is continuously circulated which reduces cook times as well as the temperatures required. On average you'll use 20% less energy a month running your convection oven, as compared to a standard oven.
A good convection oven will have at least three separate convection settings: pure convection, convection bake, and convection broil. The oven will also have the standard oven settings of bake and broil. In general, you will reduce the cooking temperature by 25Â° when using a convection setting.For example, if a recipe calls for a standard oven setting of 350Â° then reduce the temperature to 325Â° for a convection setting. Some convection manufacturers claim that it takes less time to cook foods on convection settings. convection oven, unlike a regular oven, has an internal fan in the back of the oven chamber. The fan circulates the oven air around foods creating a cooking environment that tends to eliminate hot spots and produces foods that are more evenly cooked.