Volcanos 9.2

____________is a vent in earth crust through which milted or molten rock flows.

• magma

• volcanos

• lava

• hotspots

The Cascade volcanoes are formed by the subduction of an oceanic plate under a continental plate.This statement indicates that they were formed at which of the following location ?

• mid-ocean ridge

• hotspot

• convergent plate boundary

• divergent plate boundary

Rhyolite-forming magma has more silica ?

• True

• False

Which layer of Earth is liquid and made up of nickel and iron ?

• inner core

• crust

• mantle

• outer core

Which kind of volcanos flow is also called Lahar.

• lavaflow

• midflow

• waterflow

• pyroclastic flow

____________involve an oceanic and a continental crust.Fill the blank.

• Convergent boundaries

• Plate boundaries

• Divergent boundaries

What type of volcano is Kilauea , Which is located in Hawaii ?

• caldera

• composite volcano

• shield volcano

Which volcanic gas can block out sunlight ?

• hydrogen

• oxygen

• nitrogen

• sulfur dioxide

A very hot area below Earth crust is called composite volcano ?

• True

• False

What is a characteristic of low silica magma ?

• light color

• low viscosity

• high viscosity

• ash