Answer:

1. Straight, curved and intersecting lines

2. Lines are used in images to indicate movement and direction.

3. This directing of our sight in a specific direction is sometimes reffered to as the line of sight. It is rather simple principle: In order to view an object, you must sight along a line at that object; and when you do light will come from that object to your eye along the line of sight.

4. The author chosen to use this because this means in every situation or disasters we should prepare ourselves and the things we need to prevent injuries and communicate to others.

5. It would no longer be a volcano, it may be any other thing