From a long-term perspective, warm periods in Earth's climate are associated most with increased atmospheric concentrations of ____________________
Fill in the blank(s) with correct word
carbon dioxide
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Why doesn't the Moon fall toward Earth like apples do?
A. Moon does fall, but it falls around Earth due to its tangential motion. B. The great distance of the Moon prevents falling C. Moon does fall but its great distance keeps it from getting closer. D. Moon's small mass prevents falling.
What three-factor model is used for representing the impact on environment? What is a fourth factor that could be added to this? Give a simple explanation for each factor and describe what it means in terms of human impacts on the environment
What will be an ideal response?
What region generates the most refugees, currently numbering about 6 million?
A) Africa B) Europe C) former Soviet Union (Russia + surrounding countries) D) Latin America E) Mediterranean
When compared to coastal regions, solar energy extends ________ into the water column and concentrations of nutrients are ________ in the open ocean
A) deeper; greater B) deeper; lower C) less; greater D) less; lower