Why are most active volcanoes associated with plate tectonic boundaries?
A) Plate tectonic boundaries are created by volcanism.
B) Spreading or sinking plates interact at plate boundaries with other materials to produce magma.
C) Earthquakes at plate boundaries bring large amounts of magma to the surface.
D) In reality, most volcanoes are in the plate interiors rather than at plate boundaries.
B
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The global spread of low-level radioactive contamination for Japan's Fukushima power plant in 2011 illustrates transboundary issues associated with atmospheric circulation
Indicate whether the statement is true or false
) After the 11th century, towns grew in size and importance in part because landlords raised taxes on peasants
Indicate whether this statement is true or false.
What is a symbiotic relationship? What will be an ideal response?