Which of the following places is the result of volcanoes erupting over a hot spot in the mantle?
A) the Himalayas
B) the Appalachians
C) California
D) Hawaii
D
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Aluminium has atomic number 13 . In its ground state, how many electrons are in its n = 1 shell?
a. 6 b. 2 c. 3 d. 10 e. 16
Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in series with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in series with the other two. As the lightbulbs are added, the individual
currents in the lightbulbs (neglect the battery’s internal resistance) 1.increases. 2.decreases. 3.remains the same. 4.Need more information.
Earth has been gradually warming over the past few decades. Based on a great deal of evidence, scientists believe that this warming is caused by ________
A) the human release of chemicals called CFCs into the stratosphere B) the increase in forest fires during recent years C) the fact that our politicians spout a lot of hot air D) human activities that are increasing the concentration of greenhouse gases in Earth's atmosphere
On a clear night when an observer in Los Angeles sees a first-quarter Moon, an observer in London would see
a. a full Moon. b. a first-quarter Moon. c. a new Moon. d. a third-quarter Moon. e. any of the other choices; it depends on the time of day.