All silicate minerals contain B.Silicon and C.oxygen
If you weren't sure you can search up silicate minerals and it will pop up and give you everything you need to know about silicate minerals
I guess this could be personal prefrence, but I think that most people would live near the Tropic of Capricorn because the Arctic Circle would way to cold to habit and live there all year.
1,2, and 3 are right but statement 4 is wrong.
I suppose you should have gotten your answers from the video, but it should be "Higher" and "Lower" respectively.