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.
Most recipes assume that the cook is using a conventional oven. If you are baking in a convection oven, you will need to adjust the recipeâs total baking time and oven temperature. With the increased rate of heat transfer, convection ovens cook food up to 25 percent faster than conventional ovens.Check for doneness well before the given cooking time has passed.ost recipes assume that the cook is using a conventional oven. If you are baking in a convection oven, you will need to adjust the recipeâs total baking time and oven temperature. With the increased rate of heat transfer, convection ovens cook food up to 25 percent faster than conventional ovens.