'Exert' means to apply force on influence over something else, this can be in a negative or positive way. In this quotation, it means that language, if used correctly, has the ability to express a 'hidden power'. It's also worth mentioning that the simile is relevant as the moon has an influence on the level of tides on Earth.
2. Interest in everyday life
3. Focus on social issues
4. Focus on nature and beauty
Hope this Helps!!
One time when I was doing a discussion, We were the second group to go. I waited and listened to the first groups reasoning and used that to back up my arguing. By using their information I was able to create questions for the discussion.