It's either Coal or Petroleum. I'm leaning more towards petroleum.
The scientist will publish it and do further observations in order for it to be 100% accurate
Often, waterfalls form as streams flow from soft rock to hard rock. This happens both laterally (as a stream flows across the earth) and vertically (as the stream drops in a waterfall). In both cases, the soft rock erodes, leaving a hard ledge over which the stream falls
I already helped but
1) C
2) B
3) D
4) A
5) F
6) E
