2)a. an abyssal plain is among the flattest, smoothest and least explored regions on Earth, Abyssal plains are key geologic elements of oceanic basins. 

2)b. A seamount is a mountain range rising from the ocean floor that does not reach to the water's surface.

2)c. Continental drift is the movement of the Earth's continents relative to each other by appearing to drift across the ocean bed.

2)d. A submarine canyon is a steep-sided valley cut into the sea floor of the continental slope, sometimes extending well onto the continental shelf.



3)a. What is the meaning of C.R.I.M.E.?

3)b. How much water is on the Earth?