Which crustal features form at convergent boundaries? A. Mid-ocean ridges, rift valleys, and faults
B. Mountains, volcanoes, and mountain ranges
C. Mid-ocean ridges, volcanoes, and faults
D. Mountains, rift valleys, and faults

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

the law of original horizontality explains:   why rocks appear in layers. correct answer: b the law suggests that all rock layers are originally laid down (deposited) horizontally and can later be deformed.   the principle is used by geologists to make assumptions about the relative ages of sedimentary rocks.