Short-term climatic changes may be caused by ____
a. orbital eccentricity
b. axial tilt
c. precession of the equinoxes
d. volcanic activity
e. a combination of orbital eccentricity and axial tilt
d
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Shield areas in continental interiors are characterized by ________
A) flat river valleys that cut through older mountain ranges B) linear chains of mountains less than 100 million years old C) flat areas that include rocks older than 1 billion years old D) ancient coastal regions that have become abandoned and eroded
What percentage of the Sun's energy that reaches Earth is reflected back into space?
A) 4 B) 6 C) 23 D) 30 E) 47
Crop rotation can be an effective alternative to pesticides to control pests.
Answer the following statement true (T) or false (F)
Which of the following gives the name for a wind that blows at a constant speed parallel to curved isobars or contour lines?
A. geostrophic wind B. cyclonic wind C. gradient wind D. convergent wind