25.3 25.4 Flashcards
what is the boundary that marks density between layers?
discontuity
how are discontuinies identified?
seismic waves
what are shadow zones?
are areas where no seismic waves are recorded
what is another name for shadow zones
dead zone
what degrees do shadow zones fall
105 and 140
it the outer core a solid or a liquid
liquid
why is the inner core a solid?
because of the pressure
what makes up the lithosphere?
its made up of the crust and the upper most mantle
what is the asthenosphere
a plastic like layer which earths plates moves
what elements make up the mantle
calcium,aluminium,iron,and magnesium
what makes up the core
iron and nickel
viscosity
is the measure of a fluid’s resistance flow
silica
is the chemical compound silicon dioxide which is common ingredient most magma
cinder cone volcanoes
tend to be small, have heights in the hundreds of meters range
shield volcanoes
are broad flat structures composed of layers upon layers of lava flow
composite volcanoes
are large steep-sided often thousands of meters high
what is molten or liquid rock stored inside earth called
magma
where is the ring of fire located
pacific ocean
what are two specific location where volcanic activity occurs due to divergents
East African rift and the mid Atlantic ridge
what are two specific location where volcanic activity occurs due to divergents
East African rift and the mid Atlantic ridge
Are hotpots stationary
yes
if magma has a high viscosity will it contain more or less silica
more
what pyroclastic material
any solid material that that erupts from a volcano
what is the smallest pyroclastic material
ash
what is the largest pyroclastic material
blocks and bombs
what are the types of gasses that erupt from a valcano
water vapor, carbon dioxide, and sulfur dioxide
how are volcanoes classified
size, shape, and material that erupt form them
what are the three types of volcanoes
cinder cone, shield, and compsite
