The picture above shows a muddy limestone that was deposited in the shallow waters of a lake. The pocket knife is sitting on a high region of the rock. The pink arrow points along a low trough or groove in the rock, and several other such grooves are evident. The rock is: 单项选择题
A
Right-side-up; you are looking at the side that was facing up toward the sky when the rock was deposited.
B
Upside-down; you are looking at the side that was facing down toward the center of the Earth when the rock was deposited.
C
Edge-on; the side that was facing up toward the sky when the rock was deposited is now facing toward the upper-right-hand-corner of the picture.
D
Edge-on; the side that was facing up toward the sky when the rock was deposited is now facing toward the lower-right-hand-corner of the picture.
E
Edge-on; the side that was facing up toward the sky when the rock was deposited is now facing toward the lower-left-hand-corner of the picture.
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