Active earthquake and volcanic activity are occurring along the Mid-Atlantic Ridge (A). Plate divergence is allowing magma to come up from the mantle to form a ridge on the ocean floor. Furthermore, uneven rates of divergence along the ridge help to create earthquakes along transform fault boundaries.

In contrast, the Canadian Shield (B) is an ancient landscape now devoid of active earthquake or volcanic activity.

The Himalayas (D) may have earthquake activity due to the collision of two continental plates resulting in compression and folding but this area lacks volcanic activity.

The Grand Canyon (C) is currently not an active volcanic region. For further information on the geology of this area click here.