Question

.explain how a stream in a limestone rich area can petrify an object left in the stream ​

Answer 1

by process called diagenesis

limestones have a capacity to take water inside through pores.

Limestones originate as soft lime muds, shells and other fragments of the organisms living in the water. When these sediments are buried under others, they are compacted, the water is squeezed out of pore spaces and, in some cases, mineral grains are physically re-organised or chemically changed by the pressure.

Later, mineralised waters percolate through and minerals precipitate into the pore spaces, cementing everything together to form a rock.