Plate Tectonics

Mid-ocean ridge is formed by

• converging oceanic-continental crust

• diverging oceanic-continental crust

• two diverging continental crusts

• two diverging oceanic crusts

Ocean trenches are formed by

• diverging oceanic-continental crusts

• converging oceanic-continental crusts

• two diverging oceanic crusts

• two converging continental crusts

Volcanoes are formed by converging plate boundaries while earthquakes are formed by

• transform boundaries

• divergent boundaries

• convergent boundaries

• both convergent and divergent boundaries

Plate tectonics is caused by

• ocean currents

• gravitational forces

• Earth's magnetic field

• convection current of the magma

What plate boundaries associated with volcanic island arcs?

• diverging two continental crusts

• converging two oceanic crusts

• converging oceanic-continental crusts

• diverging oceanic-continental crusts

The Great Rift Valley in Africa is formed by

• two converging continental crusts

• two diverging continental crusts

• two converging oceanic crusts

• converging oceanic-continental crusts

With an increasing distance from an earthquake the P-S wave lag time

• increases

• decreases

• remains the same

• increases then decreases

Which hazard is generally NOT associated with a volcanic eruption?

• ash

• lahar

• sinkhole

• lava flow

What is the most plate boundaries around Pacific Ocean?

• transform boundary

• divergent boundary

• convergent boundary

• both divergent and convergent

Sea level changes off the coast of North Carolina are responsible for the formation of what shoreline land-form?

• The Outer Banks

• The Fall Zone

• The Catawba River

• The Appalachian Mountains