000 2,000 3.

This question says that a 3,000 meter vertical borehole located is drilled at each point and asks for the total thickness in meters of coal. I'm not great at visualizing things in 3D so I have no idea where to start.

This question also ask about the name of contact point between Sandstone2/Coal1, Sandstone1/Pluton and I don't understand what it is trying to ask. The exact wording is What is the contact between Sandstone 2 and Coal 1 called.

1.000 2,000 3.000 Ground Surface Borehole C Undifferentiatedsedimentary rocks Borehole I meters Borehole A Undifferentiatedsedimentary rocks