Question

plates and volcanoes quick check
which is caused by the difference in density of oceanic and continental plates? (1 point)
○ subduction
○ pyroclastic flows
○ rift valleys
○ hotspots

Explanation:

To solve this, we analyze each option:

• Subduction: Oceanic plates are denser than continental plates. At convergent boundaries, the denser oceanic plate subducts (sinks) below the less - dense continental plate. This is directly related to the density difference between oceanic and continental plates.
• Pyroclastic flows: These are fast - moving currents of hot gas and volcanic matter, usually associated with volcanic eruptions, not plate density differences.
• Rift valleys: Form at divergent boundaries where tectonic plates move apart, typically between continental plates or in oceanic ridges, and are not caused by the density difference between oceanic and continental plates.
• Hotspots: Are areas of volcanic activity that result from plumes of hot mantle material rising, independent of the density difference between oceanic and continental plates.

Answer:

A. subduction