Julius Caesar 2.2 Performance: Calpurnia, Lines 13-26a

The transcript describes a series of ominous and unnatural events, including a lioness giving birth in the streets, graves opening, and a celestial battle. These events are accompanied by sounds of chaos and fear, culminating in a sense of dread and uncertainty about the future.

What does the phrase 'graves have yawned and yielded up their dead' imply?

How does the text convey the theme of fear?