Kids' Summer Crafts: Build an Ecosystem
Here's what you'll need: 3 empty and clear 2-liter bottles clear packing tape aquarium gravel (or fine, rinsed pea gravel) water de-chlorinator (optional) rubber band 4-inch square piece of netting soil mustard, rye or alfalfa seeds fish, snails or other aquatic life elodea or other aquarium plants duck weed crickets, pill bugs or earthworms a couple dead leaves or small sticks