25.4 Flashcards
(29 cards)
What is boundary that marks a density change between layers?
Discontinuity
How are discontinuity identified
By using size mic waves
What is a shadow zone?
No size mic waves have been recorded
What is another name for shadow zone
dead zone
what are the degrees that the dead zone falls threw
105-140
is the outer core a solid or a liquid
liquid
is the inter core a solid or a liquid and why
solid because of the pressure
what makes up the lithosphere
the crust and the uppermost part of the mantle
what is the asthenosphere
plastic like layer that Earth plates move on
what elimits make up the mantle
calcium, aluminum, and magnesium
which elements make up the core
iron and nickle
The measure of a fluids resistance to flow
Viscosity
A chemical compound silicon dioxide, sica, which is a common ingredient in moat magma
Silica
Tend to be small, have heights in the hundreds of meters range, and have short eruption cycles
Cinder Cone Volcano
Broad, flats structures composed of the layer upon layer of lava flows
Shields Volcanoes
Large and steep- sided, often thousands of meters high and tens of kilometers across the base, and composed layers of both lava and ash
Composite Volcanoes
What is the molded or liquid rock in the middle of the Earth called
magma
Where is the ring of fire located
Pacific Ocean
what form when tectonic plate collide with subduction zones
Volcanoes
what two specific location have volcanic activity due to divergents
East African rift valley, Mid Atlantic Ridge
Are hot spots stationary
yes
what are created form hot spots
islands( the Hawaiian Island)
if a viscosity is higher, is it going to flow faster or slower
slower
if magma has a high viscosity is it going to have more or less silica
more silica
