What did Glatzmaier and Roberts' model suggest as a reason for magnetic reversal?
A) interactions between magnetic fields in the inner and outer cores
B) alterations to forces on Earth by other planets
C) alterations to forces on Earth by changes in the Sun
D) metamorphism of rocks in the crust
Answer: A
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Which of the half-reactions below would be complementary, balance the following half-reaction, and be chemically reasonable? Br2 ? 2 Br-
A. K ? K+ B. 2 K ? 2 K+ C. K ? K+2 D. K+ ? K E. 2 K+ ? 2 K
Compared to the “boundary course,” why would the present course of the Mississippi River be an advantage to river traffic such as barges?
The following questions are based on Map T-5, a portion of the “Jackson, Mississippi-Louisiana” topographic map (scale 1:250,000; contour interval 50 feet; dashed lines are supplementary contours at 25-foot intervals). This map shows the Mississippi River near the town of Vicksburg, Mississippi (32°49'56"N, 91°11'07"W). A color satellite image of this same region is shown in Figure 40-5 (scan the QR code for this exercise or go to the Lab Manual website and Exercise 40). The eastern bluffs of the Mississippi River floodplain can be seen in the southeast corner of the map. The dashed black line along the Mississippi River shows the state boundary between Mississippi and Louisiana. Notice that the “boundary course” of the Mississippi River is quite different from the present course of the river. Some of the changes were natural, others were artificial. There is an extensive set of artificial levees along the course of the river (shown with closely spaced brown tick marks). What will be an ideal response?
Consider a substance that has high heat capacity. As compared to a substance with low heat capacity, when an equal amount of heat is applied to both, the high heat capacity substance will __________.
-become more salty -turn to a liquid -become so viscous that it won't flow -explode -heat up much more slowly
The process by which members of isolated populations become so different in genetic makeup that they cannot produce live, fertile offspring if they are rejoined is best described as
a. geographic isolation b. reproductive isolation c. evolutionary isolation d. endemic isolation e. niche isolation