Which is not an example of an earth system cycle?
a. seasons
b. tsunamis
c. food web
d. day and night

Answer is B. Tsunamis. Think of it like this, what changes and has a pattern to it. Seasons change from fall, winter, spring, and summer. Day changes to night. Food webs change when a new species is introduced into the environment or a species decides to relocate to find better food. Tsunamis are just natural disasters that don't change. A tsunami is just a tsunami. They cause the same damage each time.

The best answer option is b. tsunamis