Synthetic materials are made by chemically changing the starting substances to create a material with different characteristics. Some examples of synthetic materials are plastics, medicines, and new fuels. A synthetic substance may be chemically identical to a naturally-occurring substance or may be different
Sweat helps you cool down in two ways. First, it makes your skin feel cooler when it's wet. Second, when it evaporates, it removes heat off your body! Hope this helps! :)