Ch 25.3- 25.4 Flashcards
What is the boundary that markes density change between layers
Discontinuity
How are discontinuitys idenitfide?
By using seismic waves
What are shadow zones?
Areas where seismic waves are not recorded
What is another name for shadow zone
Dead zone
Where are the degreas where the showed zone fall?
105-140
Is the outter core a liquid or a solid?
liquid
Is the inner cord a liqid or solid, why?
solid because the presher
What makes up the lthosphere
crust and the uppermost mantal
What is the asthenosphere?
plastic light lary witch earch’s plates move on
Whitch elements make up the manytle?
calcium, alumminum, iron, magnesium
Whitch elements make up the core?
iron, nick
Viscosity
measure of a fluid’s resistance to flow
silica
the chemical compound siliscon dioxide SiO2 a common ingredient in most magama
cinder cone volcanoes
small, has hights in hunderds of meters range and have short eruption cycles
sheid volcanoes
borad flat structures composed of layer of lava flows
composite volcanoes
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
what two locations have active volcanoes due to divergents
mid-atlantic rige and the east african rift
Do hot spots stay put?
yes
what can hot pots create
ilands )(hawaii)
the higher the viscosity if th viscocity high will the fluwed flow fast or slow?
slow
if magma has a high viscosity will it contan more or less viscositie
more
what is pyroclastic material?
any sold material from a volcanoe
what is the smallest pyroclastic material
ash
what is the largest type of pyroclastic
volcanoc blocks and boms
what are types of gasses volcanoes erupt?
water vapor, carbon dioxide, sulfor dioxide
what are the eruptive styles?
depends on magma composition and velocity
how are volcanoes classified
size, shape, materials that erupt
what do cinder cone erupt?
high-tempersture, gas-rich, basaltic lava
how are shiled volcanoes formed?
low viscosity, basaltic
