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What were the gases in the air 4.5 billion years ago?
4.5 billion years ago the earth was a molten ball surrounded by hydrogen and helium.
Why is the top of an oven hotter than the bottom?
Because - hot air is lighter than cold air - and thus it rises.
Why does cold air have a greater volume than hot air?
It does not so there can be no answer to your question.
How do you think the density of heated air compares to the density of cooler air?
The density of heated air is less than the density of cooler air.
Is nature a boon or a curse to man?
Answer It isn't nature that is the curse to man. Man is his own worst enemy. I don't know how old you are but I am in my late 50's and the air that I used to breath when I was ten years old was a lot cleaner than it is today, thanks to man's inovations and greed for money we have no one to thank for the way the earth is screwed up, but ourselves. Look at all the polution in the air today. How many people die of Cancer each year is staggering and it's not only cigarette smoke that causes Cancer. Many people die from Cancer each day and they never smoked a cigarette in their lives. If anything we have to be grateful that we have mother nature and green forests to soften the blow of acid rain and chemicals that flow through the air from one Country to the other.
