What kind of front sometimes spawns tornadoes between an advancing cold and dry air mass and a warm moist air mass?

Question

1) cold 3) stationary
2) warm 4) occluded

Answer 1

what component of earth's atmosphere is most likely to cause climate change over the next few decades?
1) water vapor 3) nitrogen
2) carbon dioxide 4) oxygen

Answer 2

What is your choice?

Answer 3

For first one I think occluded and for second one I think water vapor

Answer 4

Is this correct?

Answer 5

1, yes. 2, absolutely not!

Answer 6

Would the second one be carbon dioxide?

Answer 7

Yes. There is huge controversy all over the world now (and for several years now) over how to control carbon emissions from power plants, cars, and other man-made sources of carbon dioxide.

Answer 8

Thank you