Productivity in the summer in the polar regions is:
a. high, due to abundant sunshine and nutrient-rich waters
b. high, due to abundant sunshine, warm temperatures, and clear waters.
c. average, due to abundant sunshine and clear waters.
d. low, due to a lack of nutrients.
a
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A boundary dispute in which there are no land boundaries concerns
A. North and South Korea B. Mongolia and China C. China and Russia D. The Spratley Islands
An important agricultural hearth is
A) southeast Asia. B) south and central America. C) sub-Saharan Africa. D) northern China. E) All of these are important agricultural hearths.
The influx of high-energy radiation and tiny particles varies as the Sun's intensity changes or when a ________ occurs, which is a stellar explosion at astronomically close distances.
A. solar eclipse B. quasar C. pulsar D. supernova
What happens at a convergent plate tectonic boundary?
A. Subduction B. Hot spot volcanism C. Seafloor spreading D. Transform faulting