1 clear, tall, airtight container (such as a large empty plastic jar with a screw top or a glass canister with an sealed lid)
small plants (such as mosses, ferns, philodendron, pothos, African violets)
pebbles or broken flowerpot chips
filtering charcoal (not barbecue charcoal) Note: You can find this at pet stores.
2 small thermometers (about 4-5 inches long)
paper towel or cloth