It's impossible to answer this from the information you have given. It is like saying "How long is a piece of string?"
It depends entirely on which plastic you're considering, the form that it exists in (i.e. dimensions), and how you're defining "strong". Tensile strength? Yield strength?
Strong plastic, of course.
Clear plastic is waterproof.
polycarbonate is the strongest clear plastic.
Lexan is one example of strong transparent plastic.
yes, clear plastic is man-made and is very bad for the environment
Clear plastic is transparent.
There are many online shops that sell clear plastic. Amazon.com is one of online shop that sells clear plastic with any kind of models. You can visit www.amazon.com
Yes they are clear plastic
See-through plastic
no
yes
Glass is more durable than plastic. Plastic is a porous material, which means with absorbs moisture and contaminants. Plastic will also deteriorate when exposed to sunlight. Basically a plastic window would turn yellow and become brittle after only a few years, where a glass window will remain clear and strong for a very long time.