________ is one of the gases that has a constant concentration in the lower atmosphere but is considered a "trace" gas
What will be an ideal response?
Answer: Neon, Helium, Krypton, Hydrogen, or Methane
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The eruption that occurred on Mount St. Helens was triggered by a
A) huge landslide caused a lateral blast that knocked down trees and buildings. B) fast-moving viscous lava flow flowed through the middle of Portland. C) volcano that was so heavy that it caused part of the island to collapse. D) cinder cone that sent up a large column of pyroclastic material. E) None of these are correct.
Placental mammals give birth to live young
a. True b. False
Ulrich Beck sees “reflexive modernization” as a sign of hope. What is “reflexive modernization?”
What will be an ideal response?
The third most abundant element in the Earth's crust is ________; it is more common than iron.
A. magnesium B. fluorine C. calcium D. aluminum E. tin