Conducts electricity
What will be an ideal response?
Physical
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Which of the following statements best describes a critical mass?
A) A critical mass is the minimum amount of material that will undergo nuclear detonation. B) A critical mass is the minimum amount of material that will spontaneously undergo a chain reaction. C) A critical mass cannot be assembled from smaller, noncritical pieces of material. D) A critical mass will detonate when it is separated into subcritical pieces. E) none of the above
Since the Industrial Revolution, climate change data shows that ________
A) glacial regions are decreasing while forestry areas are expanding B) rainfall has increased significantly in eastern North and South America C) rainfall has decreased significantly in North America and Europe D) desert and glacial regions are increasing E) glacial regions are increasing while more forestry areas are expanding
Read the following paragraph to answer the question:The Mt. St. Helens eruption in Washington state in 1980 measured 5 on the volcanic explosivity index (VEI). Only 57 people died from the Mt. St. Helens since most people were warned to evacuate the area prior to the event. Four years later, in 1985, Nevado del Ruiz in Colombia erupted. While only measuring 3 on the VEI, the eruption resulted in 25,000 deaths when unsuspecting residents of local towns were overrun by fast-moving lahars.Which of the following statements about volcano-related deaths best fit the information given in the paragraph?
A. Volcanic eruptions often kill thousands of people. B. The death toll from volcanic eruptions do not always correlate to explosivity, and can be affected by human actions before and after the eruption. C. The death toll from a volcanic eruption is directly related to its volcanic explosivity index (VEI). D. Most volcano-related deaths occur from lahars.
Domestic cattle production and rice agriculture release relatively large amounts of which gas into the atmosphere?
A) Carbon dioxide (CO2) B) Chlorofluorocarbons (CFCs) C) Methane (CH4) D) Ozone (O3) E) Water vapor (H2O)