1'A solar eclipse occurs when

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• 1.   A solar eclipse occurs when  
•   Earth blocks the Moon from the Sun.
•  
• B.   the first four planets are in a line.  
• C.   the Moon blocks Earth from the Sun.
•  
• D.   the last four planets are in a line.  

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3.   Asteroids have formed from A.   the
coalescence of hydrogen gas.   B.   leftover
rocks and fragments.   C.   an interstellar dust
cloud.   D.   the big bang.  
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5.   Igneous rocks form from   A.   sediment.
  B.   mud.   C.   gravel.   D.   magma.  
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8.   Suppose that you are the doctor of a patient
who has high blood pressure. How could you
determine whether this patient's blood pressure
rises if he/she talks while the measurement is
being taken?   A.   Take the patient's blood
pressure in the office while talking and compare
it with the patient's blood pressure while not
talking.   B.   Ask the patient if talking raises
his or her blood pressure.   C.   Ask the patient
to keep a diary of all activities during a
24-hour period and take the blood pressure during
a typical activity.   D.   Ask the patient to
speak softly, then loudly, then angrily, and take
blood pressure readings each time.  
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10.   On a July day large cumulonimbus clouds are
forming. It is very warm and humid and the
barometer is falling. The weather prediction
might be   A.   fog.   B.   a tornado.   C.   a
hurricane.   D.   thunderstorms.  
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11.   Nights tend to be cooler than days because
  A.   winds blow more strongly at night.   B.
  the part of Earth in darkness receives less
energy.   C.   cooler air in the upper atmosphere
drops closer to Earth's surface.   D.   water
vapor condenses when it is cooled.  
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12.   Cold air masses that form at high latitudes
are called   A.   polar air masses.   B.
  continental air masses.   C.   warm air masses.
  D.   maritime air masses.  
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13.   When the Northern Hemisphere is tilted
toward the Sun, which season occurs in the
Southern Hemisphere?   A.   fall   B.   winter
  C.   spring   D.   summer  
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14.   Plankton float near the surface and move
with the currents and the tides, nekton move
about freely, and benthos live on the ocean
bottom. An example of a nekton is a   A.
  sponge.   B.   crab.   C.   lobster.   D.
  tuna.  
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15.   The primary cause of continental drift,
earthquakes, and volcanic eruptions is   A.
  convection currents beneath Earth's crust.   B.
  the rotation of Earth on its axis.   C.   the
gradual sinking of Earth's crust.   D.   heat
from the Sun warming the continents.  
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Answer Key
1. C 2. A 3. B 4. B 5. D 6. B 7.
A 8. A 9. B 10. D 11. B 12. A 13. B 14.
D 15. A