ch.23 Flashcards
what is the boundary that marks the density change
discontinuity
how can discontinuity be identified
by using sic mic waves
what is a shadow zone?
where no size mic waves have been reported
what is another name for shadow zones
dead zone
what are the degree from an eppasenter that shadow zones fall???
105 and 140 degrees
what can p-waves and s-waves travel through
p-waves can go through a solid and a liquid
s-waves can go through a solid
is the outer core a solid or a liquid
the outer core is a liqud
is the inner core a sold or a liquid
it is a solid do to the presser
what is a lit ho spear
the crust and the upper most mantel
what is the asthenosphere
its a plastic like layer that the plates move on
what mat italic mate riles make up the core
iron and nickle make up the core
what elements make up the mantel
calcium, aluminum, iron,magnesium.
viscosity
is the measure of fluids rest-ant to flow .
silica
is the chemical compound silicon dioxide , SiO 2 , which is a common ingredient in the magma
cinder cone volcanoes
tend to be small, have heights in hundreds of meters range, and have short eruption cycles.
shield volcanoes
are broad, flat structures composed of layer of lava flows
composite volcanoes
are large and steep-sided, often thousands of meters high and tens of kilometres across the base , and composed of layers of both lava and ash.
what is molten or liquid rocks stored in the earth
magma
where is the ring of fire located
the ring or fire is located in the pacific ocean
what forms do tectonic plates collied substitution zones
volcanoes
which two locations can volcanic activity happen due to divergents
the mid-Atlantic ridge
and the east African ridge
are hot spots stationary/ do they move
no they are in a set location/ they are stuck in a spot
what are created from hot spots
volcanic islands/ Hawaii
if a liquid has a high viscosity will it run faster or slower
it will run slower
if a magma has a high viscosity dose it have more or less silica
it contains more silica
what is pyroclastic materiel
ash
what are the largest Pyroclastic material what are the types of gases that come from a volcano
blocks and bombs water vapor,carbon dioxide and sulfur dioxide
how are volcanoes classified
there size shape and the materials they erupt
what are the three types of volcanoes
cinder cones ,shield,composite volcano
