https://www.ted.com/talks/mac_stone_stunning_photos_of_the_endangered_everglades

   analyze four techniques ABOUT THIS VIDEO 
TECHNIQUES TO ANALYZE: body language: Communication achieved using facial expressions, eye contact, movements, and gestures.
diction: Diction is word choice. Professional speakers (usually) choose words carefully. Sometimes speakers will use a shocking word or phrase in order to get the listeners’ attention. How does the speaker’s diction affect their credibility? 
tone: A speaker’s tone often reflects their attitude toward the audience and the topic; it might be serious, sarcastic, concerned, outraged, annoyed, relaxed, sympathetic, bewildered, etc. Tone can be located in specific words or phrases within the speech. Imagine how different the speech could sound if the speaker had used a different word or phrase. 
authority: It may be that the speaker is an authority on the subject at hand. They may have earned degrees in the subject, conducted studies on it, or experienced the problem first-hand. On the other hand, if the speaker is not an authority on the subject, they may cite others who are. 
THOSE ARE THE DEFINITION