Glass, layered with a strong plastic.
Car windshields are typically made of a laminated safety glass which is made up of two curved sheets of glass and a plastic layer between them. They are than bonded onto the window frame of a car using a special paste.
There are a number of places where one can purchase windshields. Any local car specialist, general car stores, mail order companies, Amazon, and eBay.
Lexan
Defrost the windshields so you can see where you are going. Useful in icy climates.
There are windshields made of Acrylic Plastic. But especially in colder countries there is the problem of icing. While glass windshields can be provided with layers and electric currents to avoid icing. This especially applies for aeroplane windshields.
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That's like asking if air damages your bones.
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Polaris windshields may be purchased in some local car dealerships and car repair workshops. One could always order online. Sites like eBay, Amazon, JC Whitney all have them in stock most of the time.
Traffic collision, vandalism, flying pebbles kicked up by other vehicles, objects falling off of trucks and hitting windshields. Meteor impact is relatively rare, for car windshields.
You could go to your nearest auto place and see how cheap they do it. Or you could look up auto places on the internet and if they are fairly close to you, you could see what their prices are on fixing windshields.
"Windshield prices vary by car type and size. If bought from the dealer, they are significantly more... but most domestic and foriegn made automobile windshields can be replaced for $500-700 USD."