Q: You are presented with the quiz "what is smoothed by contact over long periods of time?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "contact between rocks over long periods of time causes rocks to smooth" and "sandstone, shale, and limestone are sedimentary rocks". So, what's the best answer to the question?

OPT:
(1). shale
(2). earth
(3). eras
(4). Roads
(5). soils
(6). water
(7). clouds
(8). ground
A:
(1).