What is true of bathymetry?
A) It is the discovery and study of the ocean floor's contours.
B) It uses orbiting robotic spacecrafts to enhance data.
C) It is hindered by the very presence of our ocean.
D) All of these choices are true.
Question 2
What is the origin of most abyssal plain sediments?
A) Deep-ocean basalt
B) Biological activity
C) New crust development
D) Erosion from the continent