An ecosystem is an example of a(n) ____________________ system since energy and matter are freely exchanged at its boundaries
Fill in the blank(s) with correct word
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Mass extinctions at the end of the Ordovician occurred because of
a. dramatic changes related to glaciation. b. dramatic chemical changes in seawater related to meteorite impact. c. increased solar radiation. d. decreased solar radiation. e. none of the above
Which is not a type of sandstone?
A. arkose B. coal C. quartz sandstone D. graywacke
What is the name for a country whose collapse would cause international migration, war, pollution, disease epidemics, or other international security problems?
a. tertiary countries b. manifold countries c. hot spot countries d. domino countries e. pivotal countries
Write an essay in which you discuss the role of conflict diamonds in ethnic and political conflict in Sub Saharan Africa
What is the Kimberly Process and how is it being used to address the connection between diamonds and conflict in Sub-Saharan Africa?