25.3 25.4 Flashcards
(30 cards)
What is the boundary that marks the density change between layers is called
Discontinuity
who can discontinuities be identified?
Studying seismic waves
what is the shadow zone
Areas where no seismic waves have been recorded
what is another name for a shadow zone
dead zone
where is the shadow zone
105 and 140 degrees from the epicenter
is the outer core a solid or liquid
liquid
is the inner core a solid or liquid and why
It is a solid due to preasure
what is the lithosphere
The crust and uppermost mantle
what is the asthenosphere
a weaker plastic like layer
what metallic materials make up the core
iron and nickel
what elements make up the mantel
calcium, magnesium, aluminum, iron
the measure of a of a fluids resistance to flow
viscosity
chemical compound silicon dioxide SiO2 which is a common ingredient in most magma
Silica
a crack in earths crust, small and have heights in the hundreds of meters range
Cinder cone volcanoes
broad flat structures composed on layer and layer of magma
shield volcanoes
large and steep structures often thousands of meters in hieght
composite volcanoes
what is molten rocks stored inside earth called
Magma
Where is the ring of fire
pacific ocean
what forms when tectonic plate collide with subduction zones
Volcanoes
which two specific locations can volcanic activity occur due to divergent plate boundaries
East Africa rift, Mid Atlantic ridge
Do hot spots move
No they never move
What are created from hotspots
Islands ( Hawaii )
If a liquid has a high viscosity will it run fast or slow
slow
If Magma has a lot of silica is the viscosity high or low
High
