Question

match the sedimentary rock with its metamorphic equivalent. click the item in the left column. use the plus sign to move it up or the minus sign to move it down until it matches the correct entry in the right column. lock your answer in place by clicking the square beside the item. (a checkmark means it is locked.) limestone slate shale marble coal quartzite sandstone graphite

Explanation:

Limestone metamorphoses into marble. Shale metamorphoses into slate. Coal can metamorphose into graphite. Sandstone metamorphoses into quartzite.

Answer:

limestone - marble
shale - slate
coal - graphite
sandstone - quartzite