1.What aspects of snowflakes does the professor mainly discuss? Click on 2 answers
A. How they develop into complex structures
B. How they are affected by the presence of ozone
C. The challenges researchers face in studying them
D. The function of their quasi-liquid


2.What does the professor say about the role of water vapor in snowflake formation?
A. Too much water vapor prevents the initial “dinner plate” from forming.
B. Water vapor’s role in snowflake formation is not completely understood.
C. Water vapor molecules in snowflakes attract ice particles from the air.
D. Water vapor is necessary for snowflakes to be able to form branches.


3.What factor helps explain why no two snowflakes are alike?
A. They all freeze at different rates.
B. They all form in slightly different air temperatures.
C. They all begin with a different number of water molecules.
D. They all follow different paths through clouds.


4.How do molecules in the quasi-liquid layer differ from those in other parts of the snowflake?
A. They are not held in place as tightly as other molecules.
B. They react with ozone to keep the layer from completely freezing.
C. They prevent ice crystals from forming additional branches.
D. They are thinner than other molecules.

5.What does the professor imply about ice crystals with a large number of branches?
A. They help block harmful radiation from the Sun.
B. They form as a result of complex reactions with ozone.
C. They contribute to a reduction in ground-level ozone.
D. They have a thinner quasi-liquid layer than ice crystals with fewer branches.

6.What can be inferred about the professor when he says this:
A. He doubts that the students have understood his explanation.
B. He does not think that bricks are an ideal illustration of his point.
C. He is not sure that the information he has just given is accurate.
D. He thinks that the similarities between liquid and bricks are surprising.


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