1. Read chapter 4 (pages 77 - 82), identify new terms and write them in your note books. Write their definitions or descriptions as may apply.
Note: The new terms you write should not be less than 5 and not more than 10.
2. Write your thought about the following questions;
(a) What will happen to life on earth if the force of gravity were much less than we have it?
(b) What will happen to life on earth if the force of gravity were much more than we have it?
(c)What will happen to life on earth if there were significant amount of toxic gases (e.g. H2S) than needed?
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