How about saying that the improvement with earth magic also brings the understanding of how to apply earth magic in nontraditional ways. So upgrade to evocation with elements like this...
1. Earth----Same as it ever was.
2. Optics----Electromagnetic manipulation is earth magic. Light is an electromagnetic wave. Using earth magic to manipulate light allows veils, illusions, and lasers
3. Kinetics----There are only four fundamental forces (Electromagnetic force, Gravitational force, Strong Nuclear force, and Weak nuclear force). Kinetics is the application Electromagnetic and Gravitational force to matter. With this element you can create directly generate force as well as move air around (tornadoes, wind, etc)
4. Fire----The earth is in enormous source of heat energy. Learning how to tap into this allows you to effectively use all trappings of fire magic.
5. Entropy----The earth is also a massive entropy reservoir. Drawing from or adding to it can allow the earth mage to use decay, disintegration beams, Ramirez shields and probability manipulation.