Question

1. as described in the passage, what is toby, the robotic device, helping scientists uncover? a. why earth is made up of different layers b. the size of the large gap in earth’s crust c. the reason why part of earth’s surface has disappeared d. how many more holes in earth’s crust are out there

Explanation:

Without the passage, we can't be certain. But we analyze each option. Option A is about Earth's layer - formation which is a long - studied geological fact not likely a new discovery by a robotic device. Option B focuses on the size of a gap in Earth's crust, which might be measurable but not a typical major discovery. Option C about the disappearance of part of Earth's surface is a more novel and research - worthy topic that a robotic device could help uncover. Option D about counting more holes in the crust is a rather mundane task compared to the mystery of surface disappearance.

Answer:

C. the reason why part of Earth’s surface has disappeared