Monday, January 19, 2009
Reflection
During today's lesson. We learnt about structure and composition of atmosphere. Generally it is made up of 78% of nitrogen , 21% of oxygen and 1% of other gases like carbon dioxide and water vapor, etc. And the reason why atmosphere is essential to life is because it exerts a suitable pressure, provide oxygen which is essential for life and shielding us from sheer heat from the sun, enable sunlight to go through it and thus plants will undergo photosynthesis and provide food for us.Chen Xingru