|Using the book The Rock Cycle, year 4s are investigating each type of rock formation: igneous rock, sand and sediments, sedimentary rock and metamorphic rock.
The first stop for us is looking at sedimentary rock: stalagmite and stalactite rock formation.
In our session we have asked these questions
The sample below is from week 1. Here we can see the saturated solution of Epson salts and water. Along the string (which serves as the cave ceiling), we can see just the beginnings of stalactite formation as the water evaporates away, leaving the crystalized solid to build up into a sedimentary rock.