10. Conjunction
A conjunction is a word that connects other words or groups of words.
There are conjunctions:
and but or that for also still else
because after if though before till unless as
when where while since
11. and : we use and to connect the same type of word, phrase, or
sentence.
For example:
Atmospheric pressure varies slightly over the Earth's
surface, and variations in pressure are responsible for the
weather that we are so familiar with.
Low pressure is associated with storms, tornadoes, and
hurricanes.
12. because : we use because when the sentences are cause and
effect of each other.
For example:
We are able to survive this pressure because our bodies
(and all life) evolved in an environment where it is
omnipresent.
14. Text
Air pressure, also known as atmospheric pressure, refers to the
weight of the Earth's atmosphere pressing down on everything
at the surface. The average air pressure at sea level is 101.325
kPa (1013.25 millibar), or 14.696 lbs/sq2 (1.0333 kg/cm2).
Basically, this means hundreds of pounds of pressure are
pressing at you from all sides and at all times. We are able to
survive this pressure because our bodies (and all life) evolved in
an environment where it is omnipresent. If the pressure is
increased or decreased too much, we perish.
15. With pressure, as with a lot of things, it's all relative. Air pressure is why
high-pressure machinery, such as hydraulics, require high structural integrity
to contain the material —pressure has a tendency to equalize. It is also
partially responsible for the phrase "nature abhors a vacuum," meaning a
vacuum is hard to sustain under the pressure of Earth's atmosphere.
Atmospheric pressure varies slightly over the Earth's surface, and variations
in pressure are responsible for the weather that we are so familiar with.
Low pressure is associated with storms, tornadoes, and hurricanes.
Sometimes the air pressure at sea level can drop as low as 870 millibars,
85% of average air pressure. This only happens during the most severe
storms. Pressure variations on the Earth surface cause wind:
high pressure areas have a tendency to seek out low pressure areas, causing
gusts.
16. Egg in bottle
You will need
-glass bottle
-boiled egg
-match
-a piece of paper
21. It’s time to do the experiment!
-make a group of four students.
-the representative of each group comes in front
of the class to take the material.
-do the experiment.
-report the result of the experiment in front of
the class.
22. Egg in bottle
1.Draw the steps of the experiment
2. Result of the experiment
………………………………………………………………………………………………………………………………………
…………………………………………………………………………………………………………………………………
3. The problem of this experiment
……………………………………………………………………………………………………………………………………...
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