The U.S. population is projected to increase to over ________ by mid-21st Century
A) 250 million
B) 425 million
C) 400 million
D) 300 million
E) 1 billion
Answer: C
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How are oxygen molecules attracted to water molecules?
A. The attraction between oxygen and water molecules is a classic example of dipole-dipole interaction. B. As a water molecule is brought close to an oxygen molecule, an induced dipole results in the O2 molecule causing the attraction. C. The hydrogen bonding in water causes the attraction of the oxygen atoms in the O2 molecule to water. D. The attraction of oxygen and water molecules for one another is part of the common atom effect. Since both molecules contain oxygen, there is a built-in attraction.
Since 1980, the U.S. population has
a. shifted to the north and east b. shifted to the north and west c. shifted to the south and east d. shifted to the south and west e. shifted to the north as people seek cooler areas because of global warming
A well-sorted sediment might consist of:
a. small grains of a variety of sizes (diameters). b. large grains all of approximately the same size (diameter). c. grains of moderate but different dimensions (diameters). d. predominantly round grains. e. predominantly smooth grains.
Polar ice caps existed through most of the Cambrian
Indicate whether the statement is true or false