Day 21 in SCI110: Water cycle; plate tectonics
- Spring 2005 Schedule
- Last time:
- Return and discuss the exams
- Rock identification - how did we do?
- Rock density experiment
- Today:
- Hydrologic cycle
- Tim and Moby
- ocean/evaporation/precipitation/runoff
- evaporation/precipitation would cover the earth 85cm deep
per year
- Freshwater (3%)
- surface water
- must be filtered
- susceptible to bacterial and inorganic
contamination
- watersheds
- groundwater (25 times the amount of surface)
- naturally filtered
- less susceptible to bacterial
contamination
- stored in aquifers - see p. 358
- water table
- divides saturated/unsaturated zone
- Water use: in U.S.,
- Domestic: 150 gal/day
- Total: 1500 gal/day
- How can we foul things up?
- Salt water (97%): How can we foul things up?
- Questions for Thought: p. 372, 4-6
- Plate tectonics
- Plate tectonics
animation
- Assign topics for in-class presentations next Thursday
(p. 54)
- Tim and Moby on
- In-class worksheet: pp. 50-51
Use the internet (e.g. the USGS
website) and your text.
- We'll end by discussing the answers to the worksheet
- Homework:
- Prepare for debates
- Read
- Chp. 14: 282-293 (plate tectonics)
Website maintained by Andy Long.
Comments appreciated.