All terrestrial planets may have the same basic type of structure; such as a central metallic core, mostly iron, with a surrounding silicate mantle. The Moon is similar, but has a much smaller iron core. Io and Europa are also satellites that have internal structures similar to that of terrestrial planets.
Average ACT: 33. The average ACT score composite at Stanford is a 33. The 25th percentile ACT score is 31, and the 75th percentile ACT score is 34. In other words, a 31 places you below average, while a 34 will move you up to above average. There's no absolute ACT requirement at Stanford, but they really want to see at least a 31 to have a chance at being considered.
Stanford University GPA, SAT Scores and ACT Scores for Accepted, Rejected, and Waitlisted Students. Data courtesy of Cappex. In the graph above, you can see that the blue and green dots representing accepted students are concentrated in the upper right corner. Most students who get accepted to Stanford have A averages, SAT scores (RW+M) above 1200, and ACT composite scores above 25 (more common is SAT scores over 1400 and ACT over 30). Also, realize that a lot of red dots are hidden beneath the blue and green.