The "hole" in the Antarctic ozone ________
A) has now disappeared
B) should disappear very soon
C) was never proven to have existed
D) persists longer and longer each year
E) is invisible to satellite observations
Answer: D
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Insolation is an abbreviation for _______________
Fill in the blank(s) with correct word
Which statement is an example of a chemical change?
A. Confetti is cut from pieces of paper. B. Water evaporates from a lake. C. Ice cubes are formed in the freezer. D. A plant converts carbon dioxide into carbohydrates. E. A tree is cut down in the forest.
The Kuiper belt is the source for ________.
A. shooting stars B. long-period comets C. asteroids D. short-period comets
Ten million years from now, the East African Rift valley system will most closely resemble the modern ________
A) Red Sea B) Appalachian Mountains C) Peru-Chile Trench D) San Andreas Fault