chapter 25.3-25.4 Flashcards
what is the boundary that marks the density change
Discontinuity
how can discontinuity be identified
Seismic waves
what are the shadow zones
an area of land where no seismic waves are detected/recorded
what is another name for a shadow zone
dead zone
what are the degrees from an epicenter do shadow zones fall into
105-140 degrees
is the outer core a solid of a liquid
liquid
is the inner core a solid of a liquid, why
solid due to pressure
what is the lithosphere
the crust and the uppermost mantle
what is the asthenosphere
a plastic like layer that the plates move on
what metallic materials make up the core
nickel and iron
the measure of a liquid’s resistance to flow
viscosity
silica
is the chemical compound of silicone dioxide/ common ingredient in magma
are broad, flat structures composed of layer upon layer of lava flows
shield volcanoes
tend to be small, have heights in the hundreds of meters range,and have short eruption cycles
cinder cone volcanoes
large, steep sided, often thousands of meter high and tens of km across the base, and composed of layers of both lava and ash
composite volcanoes
what is molten or liquid rocks stored in Earth called
magma
what direction does magma want to go
up
where is the ring of fire located
pacfic ocean
what forms when tectonic plates collide along subduction zones
volcanoes
which two specific locations do volcanic activity occur
East African Rift/ Mid Atlantic Ridge
Do hot spots ever move
No
what are created due to hot spots
Volcanic islands (Hawii)
If a liquid has a higher viscosity will it run faster or slower
slower
if magma has a higher viscosity does it contain more or less silica
more
