How do the "lives" of the most massive stars end? What are the two possible products of this event?
What will be an ideal response?
Most massive stars become black holes or neutron stars.
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The spiral of cumulative causation in core regions and countries is linked to
A) import substitution in the periphery. B) backwash effects in the periphery. C) spread effects from the periphery. D) agglomeration diseconomies in the periphery. E) both C and D
Which of the following is NOT a problem associated with deforestation in the woodlands of the savannas in Sub-Saharan Africa?
A) the reliance upon biofuels B) extreme economic hardship C) shortage of biofuels D) flooding E) soil erosion
Which of these two fires started within a few minutes of each other on 8 October 1871?
A. the Peshtigo and Chicago fires B. the Peshtigo and San Francisco fires C. the Rome and San Francisco fires D. the Oakland and San Francisco fires E. the Chicago and San Francisco fires
What are the so-called greenhouse gases that trap heat?
a) carbon dioxide, methane, nitrous oxide, ozone, chlorofluorocarbons b) oxygen, water vapor, black carbon, carbon dioxide c) hydrogen, nitrogen, sulfur dioxide, oxygen d) carbon dioxide, methane, oxygen, ozone e) ozone, smog, nitrous oxide, aerosols