lunes, 17 de febrero de 2014

After the exam...

Hi guys!!

For next day we will work in a different way in math's class. As we haven't started a new Unit, we will do the reading reinforcement activity.

So go to Unit 4, page 13, activity 14. Read it (we will read it again in class) and try to solve a) and b).

If we have more time, we will read also the following (DON'T WORRY, YOU DON'T HAVE TO DO THE ACTIVITIES AT HOME).

  • There is the same amount of water on Earth as there was when the Earth was formed. The water from your faucet could contain molecules that dinosaurs drank.
  • Water is composed of two elements, Hydrogen and Oxygen. 2 Hydrogen + 1 Oxygen = H2O.
  • Nearly 97% of the world’s water is salty or otherwise undrinkable. Another 2% is locked in ice caps and glaciers. That leaves just 1% for all of humanity’s needs — all its agricultural, residential, manufacturing, community, and personal needs.
  • Water regulates the Earth’s temperature. It also regulates the temperature of the human body, carries nutrients and oxygen to cells, cushions joints, protects organs and tissues, and removes wastes.
  • 75% of the human brain is water and 75% of a living tree is water.
  • A person can live about a month without food, but only about a week without water.
  • The average total home water use for each person in the U.S. is about 50 gallons a day.
  • Water expands by 9% when it freezes. Frozen water (ice) is lighter than water, which is why ice floats in water. 


You can use the following link:

1.- Water is the only substance found on earth naturally in three forms.
a)    True (Solid, liquid and gas)
b)    False

2.- Does water regulate the earth’s temperature?
a)    Yes (it is a natural insulator)
b)    No, that is not true

3.- At what temperature does water freeze?
a)    32 degrees F, 0 degrees C
b)    212 degrees F, 100 degrees C

4.- At what temperature does water vaporize?
a)    32 degrees F, 0 degrees C
b)    212 degrees F, 100 degrees C

5.- How long can a person live without food?
a)    More than a month
b)    Approximately one week, depending upon conditions

6.- How long can a person live without water?
a)  More than a month
b) Approximately one week, depending upon conditions

7.- How much of the human body is water?
a)    66%
b)    80%

8.- How much of the earth’s surface is water?
a)    80%
b)    66%

9.- Of all the earth’s water, how much is ocean or seas?
a)    97%
b)    1%

10.- How much of the earth’s water is suitable for drinking water?
a)    1%
b)    97%

11.- Is it possible for me to drink water that was part of the dinosaur era?
a)    Yes - water is constantly recycled
b)    No, that is impossible

12.- How much water does the average residence use during a year?
Over 100,000 gallons (indoors and outside): ______________ litres

13.- How much water is used to flush a toilet?
2-7 gallons: ______________ litres

14.- How much water is used in the average five-minute shower?
15-25 gallons:______________ litres

15.- How much water is used on the average for an automatic dishwasher?
9-12 gallons: _____________ litres

16.- On the average, how much is used to hand wash dishes?
9-20 gallons:________________ litres

17.- What is the total amount of water used to manufacture a new car, including new tires?
39,090 gallons per car:______________litres per car

18.- How much water must a dairy cow drink to produce one gallon of milk?
4 gallons: ___________ litres

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