Most volcanoes and earthquakes occur along boundaries between tectonic plates because tectonic plates shift either spreading apart causing a earthquake or moving together which pushes the plate upwards causing a volcanoe
The molecule<span> is symmetric, a tetrahedron. Thus, the 4 </span>polar bonds <span>cancel each other out.</span>
Explanation:
Orbitals = (Shell number)² = 3² = 9.
