<span>The subduction of oceanic crust under continental crust predominantly produces violent and explosive types of volcanic eruption. This is because this type of lava is created at low temperatures, but would cause a violent and explosive eruption at some point in time.</span>
As the crust of the San Andrea is continuously moving due to the tectonic activity and is the main manifest of the tectonic boundary of the North America and the pacific plate. This fault along with the pacific plate will move towards the Los angles and eastern San Francisco as it moves about 3.5 cm per year.
As 1 km equals to about 100 000 cm
, then the distance of 620 km = 62, 000,000 cm and 62,000,000 will be divided by 3.5 equal to 17. 71 years to collide with the eastern side.
For much of the last quarter century, the leading theory of the driving force behind tectonic plate motions envisaged large scale convection currents in the upper mantle, which can be transmitted through the asthenosphere.
The statement, “An arid or
semi-arid climate occurs where precipitation is greater than potential evaporation”,
is false. A semi-arid climate occurs where the recipitation is below the
potential evaporation. Regions that experiences arid climate receives less than
10 inches of rainfall in an entire year.
