Describe a positive feedback system that effects earth temperatures in your own word

Positive feedback system increases temperature of the earth surface which is good in a number of ways.

Explanation: For example, due to increase in the temperature of earth surface, melting of ice occurs in the mountainous area of the world. This stored form of water is changed into liquid form and flows down through streams and used by plants and animals. But more increase in temperature causes rise of sea level which is not good for areas near the sea.

D. The witches told Macbeth that he would be king, and he is worried about his role in making the prediction come true.

Explanation:

The prophecies delivered by the witches traps Macbeth in the dilemma as he could not decide between his respect for the king and his destiny to be the king himself. He is suffering from the conflict as the predictions of the three witches were contradictory. However, after learning their prophecy of himself being the king he was delighted but at the same time distressed about his role in making their prophecy true of Duncan's murder. Thus, he was in a state of split and this prophecy marks the turning point of the story led by his conflicting state of mind.