Volcano Assessment

Front

What is the relationship between silica content in lava and its flow resistance?

Back

The higher the silica content in lava, the higher the lava’s resistance to flow.

Front

What occurs when a tectonic plate moves over a hot spot?

Back

A chain of volcanoes forms.

Front

What is the order of volcanoes from oldest to youngest formed by tectonic plate motion?

Back

T, S, R, Q

Front

What is a 'sill' in volcanic terms?

Back

A sill is a tabular sheet of igneous rock that forms when magma intrudes between layers of sedimentary rock.

Front

What is a 'caldera'?

Back

A caldera forms when the top or side of a volcano collapses into the magma chamber.

Front

Define 'magma'.

Back

Magma is molten rock located beneath the Earth's surface.

Front

What is the difference between magma and lava?

Back

Magma is underground molten rock, while lava is magma that has reached the Earth's surface.

Front

What is a 'vent' in a volcano?

Back

A vent is an opening in the Earth's crust through which volcanic materials escape.

Front

What is a 'pyroclastic flow'?

Back

A pyroclastic flow is a fast-moving current of hot gas and volcanic matter that flows down the slopes of a volcano.

Front

What is a 'dike'?

Back

A dike is a vertical or steeply inclined sheet of igneous rock that forms when magma intrudes into pre-existing rock.