. What do you think?

Short answers Some fossils contain hard parts such as shells and bones. Other fossils result from impressions left by soft biological material that has decayed and later been preserved by mineral deposits that fill in the impressions and then harden (Murck, 3.1). What do you think? Sedimentary rock is often seen along the outside edge of a mountain range, because the particles that eventually form the rock have moved down the mountain by wind and water erosion. What do you think? .More on This Topic.....