Wednesday, 5 February 2014

The Need of Groundwater

1)  News - Heat Wave in Sao Paulo and Water Shortages
❖ Read the article and try answering these questions:

                   a) Why will this bring down the economy?

                   b) Why is there water shortage?

                   c) Why is the price of electricity higher?

a) Without water, farmers won't be able to grow crops.
b) There isn't much rain.
c) In hotter days, we use more electricity. 



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2)                            Demo Research Question:

Research Question: How much salt can dissolve in hot and cool water?
What is the relationship temperature and solubility?

Independent variable: temperature (70 and 25 degrees Celsius)
Dependent variable: mass of salt
Control variables: the same volume of water (100mL)

Hypothesis: as the temperature the water increase, the amount of salt dissolved would __increase/decrease/stays the same____.

Materials:
  • 2 250 mL beakers
  • water
  • hot plate
  • 2 thermometers
  • salt
  • digital

Method
  1. Heat up water using the hot plate or a kettle.
  2. Measure 100 mL of hot water and cool water


Data:

Temperature /degrees Celsius Amount of salt /g Observations

29 19.8 lots of salt left undissolved
71 19.5 all salt dissolved

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3)    Explain possible problems with the proposed well location. List at least 4 different reasons.
  • landfill: an area where garbage is put and then dirt is put over the garbage
  • septic field: an area where human waste is put; usually it’s underground
  • impermeable: things can not pass through it.  
  • aquifer: where water is underground


Problems:
※ Pollution from the highway - such as oil and exhaust that stuck to the road - could get in the aquifer.

※ Pollution from the septic field could seep into the aquifer.  There are many diseases in human waste which could be spread through the water.  

※ The ocean water could make the aquifer salty.  Then, we wouldn’t be able to drink the aquifer water.  


※ Pollution from the landfill - such as acids and heavy metals - could go to the aquifer from runoff.  

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4)                                       Green = Dissolve     ➙    Red = Doesn't dissolve
  • salt (NaCl) and other salts (CaCO3)
  • plastic
  • alcohol
  • acids
  • bases
  • sand
  • many metals
  • glass
  • gases such as CO2
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5)                                                                Groundwater:



◇ Watch this Brain Pop
◇ Fill out this form on groundwater  Use pg. 300-304 (Earth Science)

Answers:
1)




Type of rock and soil, climate, topography (what the landscape is like), vegetation and how people use the land all affect the amount of groundwater.
2)

Porosity is how much space there is in a material. For example, cheese may be porous or non-porous. Chedder cheese is nonporous - it has no holes. It has zero porosity. Swiss cheese however is porous. It may have 10 percent porosity.
3)



Permeability is how fast water goes through something. A permeable surface, such as sand, may allow water to pass through very quickly. A nonpermeable substance, such as plastic or granite rock, may not allow water to pass at all.
4)





The water table is the top of where the groundwater. The water table can move up and down depending on the weather or the use of water.
5) Challenge:





An ordinary well draws water from the water table using a pump or by pulling it up. An artersian well uses underground pressure to get the water out of the ground.
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Skills Learned:
  • Reading Comprehension
    • Read scientific texts and summarize using own language.
  • Study Skills:
    • To use question and answers to prepare for a test
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Movie Summary:
For 700 years people have been digging tunnels under the Sahara Dessert looking for water. The dessert contains water underground because it dried out due to global climate change. 

2 comments:

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  2. I really like your post. It has all the information needed to cover up the whole lesson. You post is very organized and easliy found. One thing that you could've worked on more pictures, but either way it is a very good post.

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