chapter 25.3 & 25.4 Flashcards
What is the Boundary that marks the density change between layers?
discountinuity
How are discountinuity identify?
identify 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 solid or liquid?
liquid
Is the inner core a solid or liquid?
solid
What makes up the lithosphere?
crust and uppermost mantle
What is the asherenosphere?
a plastic like layer which earth points move
what element make of the mantle
calcium
aluminum
which elements make up the
iron
nickle
measure of a fluids resistance to flow
vicosity
chemical compound silicon Si02 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 in earth called?
magma
Where is the ring of fire located?
pacific ocean
Where is the ring of fire located?
Pacific ocean
What are two specific locations where volcanic activity occurs?
East African ridge
Mid-Atlantic ridge
Are hot spots stationary?
yes
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?
blocks and bombs
What are the type of gasses the erupt from a volcano
water vapor
carbon dioxide
sulfur dioxide
How are volcanoes classified?
size
shape
material that erupts from them
What are the three type of volcanoes
cinder cone
shield
composite
