Chemical And Physical Sunscreens: What Is The Difference?

Hello. This is my first blog and would like to start by telling about myself. My name is Irina. I want to apologize in advance if I make any mistakes in my writing: I came to USA 5 years ago and my only school here was Rizzieri Aveda School For Beauty and Wellness.  I am a practicing  skin care therapist at The Body Klinic Day Spa in Philadelphia. Skin is my passion and I would want everybody know simple ways to look good and feel great!
This morning I was hunting for new Sunscreen for my body. I started with our favorite Sephora. After I asked  sales associate to show me SPF for body she didn't even know where to go and finally pointed on face sun screen saying that one is the best. Frustrating? Yes. I had to explore the whole store and in the end I found a couple good products, but it got me thinking, girls at those stores are not very enthusiastic in educating their customers about sunscreen and its role in maintaining healthy and beautiful skin. They don't care! I do!
Firstly, I will not stop saying that sunscreen is necessary to use year around for everybody: boys and girls, white or brown skin, summer and winter!!!! Unless you don't want your skin to look good and don't care about skin cancer. I hope you are not one of those careless people who look much older than they are or going to. 
Secondly, not all sunscreens are the same. There is a huge difference between face and body sun protecting products. Body sunscreens are usually cheaper and don't have nutrients for everyday use, they are very heavy for face which can lead to breakouts. Face sunscreens are more nourishing and light and you also can choose an appropriate one for your skin type with vitamins like C or E.  All this means that it is not a good idea to use body SPF for face, but feel free to nourish your body with the one for face (if you are rich!)
Thirdly, sunscreens can be physical or chemical. The difference is in ingredient content and in the way of product protecting skin from the sun. Chemical one usually has more than two active ingredients like Octinoxate, Octissalate, Oxybenzone, Avobenzone, etc.  In order to protect the skin from the sun  they
absorb the energy of UV radiation.  Also there is a believe that chemical sunscreens are cancerous! I just know that they are not the best to use and only physical ones are broad spectrum and protect from UVB (burning rays) and UVA (aging rays) together!
Physical sunscreen ingredients are Titanium Dioxide and Zinc Oxide. They form a thin film on the top of your skin and reflect harmful ultraviolet rays without creating a chemical reaction in your skin! 
My favorite picks are Murad Essential-C Day Moisture 30 SPF for face (it has chemical and physical ingredients) $45, LaVanila The Healthy Sunscreen SPF 30 body cream for everyday use (just Zinc Oxide 20%) $38 and  Neutrogena Sensitive Skin Sunblock Lotion SPF 60+ (Titanium Dioxide and Zinc Oxide only) for the beach time $12. 
I hope, you guys, love your skin as much as I do! Be beautiful!