According to Figure 19.42, a drowned coral reef in the Caribbean that is under 70 meters of seawater is
A) about 7 million years old.
B) about 10 million years old.
C) about 12 million years old.
D) about 20 million years old.
Answer: C
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The Paleozoic–Mesozoic boundary is a major break in the geologic time scale because
a. it is marked by a mass extinction event. b. it is marked by an explosion in the quantity and diversity of life. c. it is when reptiles first appeared. d. it is when mammals first appeared. e. it is a time of great volcanic activity.
Which of the following correctly states the order in which a continental area is transformed into an ocean basin as a spreading center forms?
A. Rifting, doming, spreading, and finally centering B. Centering, doming, rifting, and finally spreading C. Spreading, rifting, doming, and finally centering D. Doming, centering, spreading, and finally rifting
?According to biodiversity researchers, the greatest threat to wild species is overhunting.
Answer the following statement true (T) or false (F)
Prior to the development of steam-powered ships, mariners relied on persistent winds, called ________, for long distance voyages
A) Westerly Winds B) Mau Loa Winds C) Trade Winds D) El Niño Winds