Last week we learned about a couple of things. We learned that frost is mainly found in the countryside and dew is mainly found in the city. In aquaponics we learned that fish waste helps give nutrition to plants and plants help clean the fish's water. We learned that P H is a measure of acidity and it hurts fish and plants if it is out of balance. This week, we harvested lettuce. We found that the lettuce had a lot of roots, and it was hard to get the gravel out because the roots were so long and tangled. In the tray with the soil, the roots were hard to get out because there was so much soil in between. We had to use 2 rulers to measure the lettuce. The lettuce was purple and green and it had spots on it. The lettuce grew better in the tray with the gravel. We washed the lettuce then weighed it. We put the lettuce in a bag, which some of it will be taken home.