Devonian mass extinctions were caused by global cooling that made the environment unfavorable for
the widespread reef organisms of the time period. Indicate whether the statement is true or false.
T
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The rain-shadow effect on the Isthmus is most pronounced
A) in the summer, on the Pacific side of the Isthmus. B) in the winter, on the Pacific side of the Isthmus. C) in the summer, on both sides of the coasts of the Isthmus. D) in the winter, on both sides of the coasts of the Isthmus.
________ is helping natural hazards to become catastrophes
Fill in the blank(s) with correct word
Geologists have shown that the east coast of the United States faces a serious tsunami threat from ________.
A. large earthquakes offshore of Portugal B. landslides along the White Cliffs of Dover C. meteor impact in the Mediterranean Sea D. breakup of Antarctic ice shelves E. volcanic flank collapse in the Canary Islands
The refraction and shadow patterns of seismic P-waves and S-waves indicate the dimensions and properties of Earth's layers.
Answer the following statement true (T) or false (F)