Which two conditions explain why special technology is required to study the deepest parts of the ocean? A. Extremely high pressure
B. Uneven terrain on the ocean floor
C. Thickness of ice on the ocean floor
D. Unusually high oxygen levels

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space.b. we'll know it immediately because it will be brighter than the full moon in the sky.c. we won't know about it until 600 years from now.d. none of the above.