The Earth's Atmosphere

Cards (12)

How many years ago was the formation of the Earth?
4.6 billion years ago
Volcanic activity released a gas that takes up most of the atmosphere, just like the atmospheres of Mars and Venus. What is this gas?
Carbon dioxide
Volcanic activity has released a gas that condenses to form oceans. What is this gas?
Water vapor
Volcanic activity released small proportions of 2 gases. What are these 2 gases?
Ammonia and methane
As green plants and algae evolve, what has happened to the amount of carbon dioxide in the atmosphere?
It has reduced as plants take it in and give out oxygen
As green plants and algae evolve, what has happened to microorganisms that can't take in oxygen?
They are killed off
As green plants and algae evolve, what has happened to the carbon from carbon dioxide?
It becomes locked up in sedimentary rocks , formed from the shells and skeletons of marine organims
As green plants and algae evolve, what has happened to other gases?
Other gases react with oxygen to release nitrogen
As green plants and algae evolve, what has happened to the way t hat nitrogen can be produced?
Nitrogen is also produced by bacteria removing nitrates from decaying plant material
As of today, what percentage of oxygen is there in the atmosphere?
About 20 %
As of today, what percentage of nitrogen is in the atmosphere?
About 80 %
True or False : The amount of carbon dioxide in the atmosphere has decreased significantly?
True