Chapter 25.3 and 25.4 Flashcards
(30 cards)
How can discontinuity be identified?
seismic waves
what is the boundary that marks the density change between layers?
discontinuity
what are shadow Zones?
where no seismic waves are reported
what is another name for shadow zone?
dead zone
between which two degrees do shadow zones fall between?
105% to 140%
Is the outer core a solid or liquid ?
liquid
Is the inner core a solid or liquid? why.
is it a solid because of the pressure.
what make up the lithosphere?
the crust and uppermost mantle
what is the asthenosphere?
plastic-like layer which Earth’s plates move on
which elements make the Mantle?
calcium
aluminum
iron
magnesium
which element make up the core?
iron
nickle
The measurement of a fluid’s resistance to flow.
Viscosity
The chemical compound silicon dioxide , SiO2, which is a common ingredient in most magma.
Silica
What tends to be small , have height in the hundreds of meter range, and have short eruption cycles?
Cinder cone Volcanoes
They are broad, flat structures composed of layer upon layer of lava flows.
Shield volcanoes
Large and steep-sides, often thousands of meters high and tens of kilometers across the base, and composed of layers of both lava and ash.
Composite volcanoes
what is molten or liquid, rocks stored inside Earth?
Magma
where is the ring of fire located?
pacific ocean
what is created when tectonic plates collide along the subduction zones ?
volcanoes
what are two specific examples of volcanic activity due to divergences.
East African rift valley
mid Atlantic ridge
Are Hotsport stationary?
Yes, they do not move only the plate above it moves
what are created from Hotspots?
Island (Hawaii, Maui, Oahu, Molokai,and Kauai
if a liquid has a higher viscosity will it flow more quickly or more slowly?
slowly
If magma has high viscosities will it contain more silica or less silica?
it will contain more
