sand is a kind of sediment & a rock is made up of small particles of sand ->  if a rock is made up of small particles of sand then that rock is made up of sediments  dark is a kind of color1 & sediment is a kind of small particle ->  sedimentary rocks are made of sediment  if a rock is made up of small particles of sand then that rock is made up of sediments & sedimentary rocks are made of sediment ->  if a rock is made up of small particles of sand then that rock is a sedimentary rock  dark is a kind of color0 & if two things are opposites then those two things are different ->  light and dark are different  dark is a kind of color & light is a kind of color ->  light and dark are kinds of color  light and dark are different & light and dark are kinds of color ->  light and dark are different kinds of colors  light and dark are different kinds of colors & a rock has light-colored layers and dark-colored layers ->  if a rock has light-colored layers and dark-colored layers then that rock has different colored layers  if a rock has light-colored layers and dark-colored layers then that rock has different colored layers & sedimentary rocks often have different colored layers ->  if a rock has light-colored layers and dark-colored layers then that rock is likely a sedimentary rock  if a rock is made up of small particles of sand then that rock is a sedimentary rock & if a rock has light-colored layers and dark-colored layers then that rock is likely a sedimentary rock ->  if a rock is made up of small particles of sand with light-colored layers and dark-colored layers then that rock is likely a sedimentary rock  if a rock is made up of small particles of sand with light-colored layers and dark-colored layers then that rock is likely a sedimentary rock & sedimentary rocks are formed by sediment compacting / cementing together -> if a rock is made of small particles of sand with ligh-colored layers and dark-colored layers then that rock was likely formed by sediments compacting and cementing together