Chapter 15: geohazards (volcanoes And Earthquakes) Flashcards
1
Q
What defines an active volcano?
A
A volcano that has erupted in the past 10,000 years and could erupt again.
2
Q
Name the four types of volcanoes.
A
Shield volcanoes, stratovolcanoes, cinder cones, lava domes.
3
Q
What is the difference between effusive and explosive eruptions?
A
Effusive eruptions produce mostly lava and occur in shield volcanoes; explosive eruptions release ash, gas, and pyroclasts, often from stratovolcanoes.
4
Q
What is a pyroclastic flow?
A
A fast-moving avalanche of gas, ash, and rock, reaching speeds up to 700 km/h and temperatures of 500°C.
5
Q
Name the three fault types.
A
Normal fault, reverse fault, strike-slip fault.
6
Q
What instrument measures ground shaking?
A
A seismograph.
