Today in class we learned a little bit about volcanoes and what makes them erupt quietly or explosively.
Quiet eruptions have low viscosity magma and low silica magma.
Explosive eruptions have high viscosity magma and high silica magma.
Tonight’s Homework: Vocabulary
Plate tectonics- the theory that pieces of Earth’s lithosphere are in constant motion, driven by convection currents in the mantle
Plates- a section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust
Convergent Boundary- A plate boundary where two plates move toward each other
Divergent Boundary- A plate boundary where two plates move away from each other
Transform Boundary- A plate boundary where two plates move past each other in opposite directions
Faults- A break in Earth’s crust where masses of rock slip past each other
Earthquake- The shaking that results from the movement of rock beneath Earth’s surface
Seismic Wave- Vibrations that travel through Earth carrying the energy released during an earthquake
Cinder Cone Volcano- A steep cone-shaped hill or small mountain made of volcanic ash, cinders, and bombs piled up around a volcano’s opening
Composite Volcano- a tall, cone-shaped mountain in which layers of lava alternate with layers of ash and other volcanic materials
Shield Volcano- A wide, gently sloping mountain made of layers of lava and formed by quiet eruptions