What impact does the formation of the ozone layer have on our planet?
What will be an ideal response?
Answer: As a protective envelope, the formation of the ozone layer blocked most of the Sun's harmful ultraviolet radiation. Once this radiation was blocked, Earth's surface became more hospitable to life.
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The angle of incidence of a light wave is
a. different depending on whether there is diffuse or specular reflection. b. measured from a normal to the surface. c. equal to the angle of refraction. d. measured relative to the surface of the material.
A 1.5 kg ball is floating in water. The volume displaced by the ball is
A. 0.0015 
B. 0.0027
C. 0.0036
D. 0.0040
E. 0.0051
If an electric drill has a case ground, this means
1.its case has been ground to a shiny surface. 2.the drill uses a two-prong plug. 3.the "hot" wire and the second wire are both attached to ground. 4.the case of the drill is grounded separately using a third wire.
How would you describe the size of the following object?
a blood cell A) microscopic B) macroscopic C) submicroscopic D) all of the above E) none of the above