What caused Earth to partially melt when being formed?
A) Impact of asteroids, comets, and debris
B) Gravitational compression
C) Accumulation of decaying radioactive elements
D) A combination of all of these choices
D
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Describe the construction and problems of medium-range forecasts. Include discussion of ensemble forecasting and the role of chaos
What will be an ideal response?
Which of the following groups is most likely to disrupt local ecosystems as they search for natural resources and manufacturing sites?
A) governments B) transnational firms C) indigenous ethnic groups D) international organizations, such as the United Nations E) non-governmental organizations, such as Greenpeace
When does Earth's perihelion position, the point of orbit when it is closest to the Sun, occur?
A) During the Northern Hemisphere's spring. B) During the Northern Hemisphere's summer. C) During the Northern Hemisphere's winter. D) During the Northern Hemisphere's autumn.
________ are topographic "steps" on both sides of a river valley resulting from river entrenchment into its own floodplain
A) Entrenched meanders B) Oxbow lakes C) Nickpoints D) Levees E) Alluvial terraces