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.
How Convection Microwave Ovens Work. If youâve been shopping for a new microwave, youâve probably noticed some more expensive models that offer convection cooking. If youâre like me, you may have initially wondered what convection microwave ovens do and why theyâre pricier than standard microwaves. Put simply, convection microwave ovens use a fan to circulate hot air inside the microwave, browning and crisping food at lower temperatures. Other benefits of convection cooking include: Faster baking and roasting