Black-and-gray crystalline rocks Shiny rocks with smooth textures Rocks with visible pieces of shells in them Rocks with small interlocking crystals in them
I gave my students this multiple choice question: Jennifer has collected rocks while hiking. As she attempts to classify her rocks, which will she put in the pile of sedimentary rocks?

Only one answer is correct among these 4 choices:
- Black-and-gray crystalline rocks
- Shiny rocks with smooth textures
- Rocks with visible pieces of shells in them
- Rocks with small interlocking crystals in them

Could you tell me which one is correct?

Rocks with visible pieces of shells in them