No, that is False. They normally occur in the layer called the Troposphere. The Troposphere is where all the plains and the jets fly. The Mesosphere is too high,
Vertical and horizontal lines are static; whilst curving and diagonal lines are considered dynamic :)
Mildred is worried about being caught with books because they are against the law. She doesn't want her house burned down and sees Montag's actions as foolhardy. These actions show Mildred as a law abiding citizen who conforms to the dictates of the law