Shania is trying to determine the oldest geologic unit on this map. why is she unable to do so? there are only three units. there is no key on the map. the text on the map is too small. the units are all the same age.

Shania is trying to determine the oldest geologic unit on this map and the reason to why is she unable to do so is that  the units are all the same age.. when there is the same age, there will be no oldest geologic unit and that i cannot be credible.

1.state2.trash3.the earth