Chapter 25.3 25.4 Flashcards
What is the Boundary that marks the density change between layers?
Discontinuity
How are discontinuity identify?
identified by using seismic waves
What are shadow zones?
P-waves and S-waves
areas where no seismic waves are recorded
What is another name for shadow zones?
Dead Zone
Between what degrees do shadow zones fall?
105 to 140 degrees
Is the outer core a sold or liquid?
Liquid
Is the inner core a solid or a liquid?
Solid because of so much pressure
What makes up the lithosphere?
Crust and Uppermost mantle
What is the asthenosphere?
A plastic like layer which earths points move
What element make of the mantle?
calcium
aluminum
Which elements make up the
Iron
Nickle
measure of a fluids resistance to flow
viscosity
chemical compound silicon dioxide SiO2 common ingredient in most magma
silica
tend to be small have heights in the hundreds of meters range and have short eruption cycles
cinder cone volcano
are broad flat structures composed of layer upon layer of lava flows
shield volcano
are large and steep sided often thousands of meters high and tens of kilometers across the base and composed of layers of both lava and ash
composite volcano
what is molten or liquid rock stored inside the earth called?
Magma
Where is the ring of fire located?
Pacific
what are two specific locations where volcanic activity occurs do to divergent?
east African Rift Valley
Mid Atlantic Ridge
Are hot spots stationary?
yes they are
If magma has a high viscosity will it contain more or less silica?
More
What is Pyroclastic material?
Any solid material that erupts from a volcano
What is the smallest pyroclastic material?
ash
What is the largest pyroclastic material?
volcanic blocks and bombs
What are the types of gases that erupt from a volcano?
water vapor
carbon dioxide
sulfur dioxide
How are volcanoes classified?
size shape and materials that erupt
what are the three types of volcaonoes?
cinder cone
composite
