1x1 ideas for Nova and star child

[Nova]

1: 2 highschool friends goes on a field trip and stumble across a strange blue rock and when they picks it up it glows brightly and when it's stops it looks like a normal rock but both soon discover they gain a couple of powers to use as they want.

2: 2 friends from school goes exploring a cave only tohave the floor fall out from under them they fall into a underground river and is taken for a fast ride only to be washed ashore on the beach of a underground lake filled with animals and primative humans not seen on the surface since the last ice age and they must find a way home before the primative humans catch them.