1. Good Morning! Tuesday, 11/10 As you come in, please take out your Mechanical Weathering Lab

2. Mechanical Weathering  Which rock type was the most affected?  How can you tell?  If your rocks lost mass, what happened to the lost mass?  Erlenmeyer flasks  What will this lost mass become?

3. Chemical Weathering  How is chemical weathering different from mechanical weathering?  Look at material list (similar to last lab)  2 Days!  We will be completing Day 1 today  Finishing the lab on Friday

4.  SOILS HAVE LAYERS CALLED “HORIZONS”  O HORIZON – LOOSE AND PARTLY DECAYED ORGANIC MATTER  Organic material is made up of living plants & animals, dead plants & organisms, and nutrients that have come from decomposed plants & animals  A HORIZON – MINERAL MATTER MIXED WITH HUMUS  B HORIZON – FINE CLAY PARTICLES  C HORIZON – PARTIALLY DECOMPOSED PIECES OF PARENT ROCK  FURTHER BELOW: UNWEATHERED PARENT ROCK SOIL HORIZONS

5.  DRAW THE HORIZON LAYERS OF SOIL AND LABEL THE CHARACTERISTICS OF EACH HORIZON SOIL HORIZONS

6.  LIVING WORMS & BACTERIA FEED ON DEAD ORGANISMS, MAKING THEM PART OF THE SOIL  HUMUS = DECAYED ORGANIC MATTER  HELPS KEEP SOIL MOIST BY SOAKING UP RAINWATER  REMOVES CHEMICALS AS RAIN SEEPS THROUGH  ROOTS CAN THEN ABSORB THESE NUTRIENTS  SOIL IS HOME FOR MANY LIVING ORGANISMS  Ants, beetles, grubs, spiders, mites, snails, worms, mice, shrews  THESE ANIMALS BURROW & TUNNEL MIXING AND BREAKING SOIL INTO TINY FRAGMENTS PRODUCTION OF FERTILE SOIL

7. Soil Layers  Soil type 1-5  Highlight descriptive words of your soil type