Christina wanted to know more about the effects of earthquakes, so she created a model and performed an experiment. in christina's model, she carefully layered different types of rock and soil in a large, clear, plastic container. after taking a picture of the layers through the side of the container, she shook the container from side to side. then, she compared the layers in the container with the picture taken before shaking and made note of the differences. what is a benefit of christina's model?