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 based on the options, it seems related to Earth - crust research. If the robotic device Toby is used for geological exploration, it could potentially help find out about features like holes in the Earth's crust.

Answer:

D. how many more holes in Earth’s crust are out there