Chapter 25.3 25.4 Flashcards
What is the boundary that density changes between layers?
Discontinuity
How can Discontinuity be identified?
By using seismic waves
What is a Shadow Zone?
Where no seismic waves have been recorded
What is another name for a Shadow Zone ?
Dead Zone
What are the degrees where Shadow Zones fall in between?
105 - 140
Is the Outer Core a Solid or a Liquid?
Liquid
Is the Inner Core a Solid or a Liquid?
Solid because of the pressure.
What makes up the Lithosphere?
The crust and the uppermost mantle.
What makes up the asthenosphere ?
Plastic like layer which Earth plates move.
Which elements make up the Mantle
Calcium ,Aluminum, Iron and Magnesium.
Which elements make up the Core?
Iron and nickel.
the measure of fluid’s resistance to flow
Viscosity
Chemical compound silicon dioxide, SiO2, which is a common ingredient in most magma.
Silica
Tend to be small, have heights in the hundreds of meter range, and have short eruption cycles.
Cinder Cone Volcanoes
Broad, flat structures composed upon layer of lava flows
CC
large and steep-sided,often thousands of meters high and tens of kilo meters across the base, and composed of layers of both lava and ash.
Composite Volcanoes
What is molten or liquid rocks stored inside Earth called?
Magma
Where is the Ring of Fire located.
Pacific Ocean
What form when tectonic plates collide along subduction zones
Volcanoes
Which 2 specific locations have volcanic activity due two divergent.
East African Rift Valley , Mid-Atlantic Ridge.
Are hot spots stationary
Yes
What tare created from Hot Spots
Islands ( Hawaiian Islands )
If a viscosity is higher is it going to flow slower or faster.
SLOWER
If magma has a high viscosity is it going to have more or less silica.
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