Mini-Environments

#ThrowbackThursday
From the ninth edition of the Boy Scout Handbook (1980)

"The environments in which you have roamed as a Scout have been as vast as your eyes could measure. But there are small environments that are also worth your study."

Aquarium:
An aquarium, as the word tells you (aqua is Latin for water). is a watery mini-environment. for this you need a fish tank or bowl with a layer of clean sand on the bottom. Fill the tank with pond water. Anchor a couple of local aquatic plants in the sand. Then introduce a few water snails and a couple of minnows or other small fish.
     If you can't get pond water, use tap water and let it stand a few days to lose its chlorine.  And if you can't collect your own plants and fish, get them from a pet shop.