Volcano Review

Volcanoes that form at subduction zones are more likely to be _______.

• composite volcanoes

• cinder cones

• calderas

• shield volcanoes

Most volcanoes on Earth form _____.

• along transform boundaries

• at divergent boundaries and subduction zones

• in the crust

• at hot spots

Shield volcanoes typically have _______.

• explosive eruptions

• layers of tephra

• basaltic magma

• steep sides

A mountain made of layers of lava and tephra is a _____.

• composite volcano

• caldera

• shield volcano

• crater

Volcanoes in Hawaii are formed by _____.

• divergent boundary

• a hot spot

• a subduction zone

• a line of hot spots

Hot spots form _____.

• at divergent boundaries

• at convergent boundaries

• at transform boundaries

• away from plate boundaries

A volcano is more likely to erupt violently if it has _____.

• low viscosity

• basaltic magma

• low silica content

• high silica content

Volcanoes erupt because _____.

• gravity is variable

• tectonic plates move

• magma is less dense than the surrounding rock

• melted rock takes up less space than solid rock

Volcanoes occur at all of the following places EXCEPT _____.

• continental- continental convergent boundaries

• continental- oceanic convergent boundaries

• divergent boundaries

• subduction zones

A caldera typically has _____.

• pyroclastic flow

• no crater

• layers of tephra

• a collapsed cone