Chapter 25.3 and .4 Flashcards
What is the boundaries that marks the density change between layers?
Discontinuity
How is Discontinuity identified?
Using Seismic waves
What is a shadow zone?
Where No seismic waves have been recorded
Another term for shadow zone?
Deadzone
What are the degrees that shadow zone fall between
105 and 140
Is the outer core a solid or a liquid?
Liquid
Is the inner core a solid or liquid?why?
Solid.because the pressure.
What makes up the Lithosphere
The crust and uppermost mantle
What is the Asthenosphere?
A plastic-like layer which earth plates moves.
Which elements make up the mantle?
- Calcium
- Aluminum
- Iron
- Magnesium
Which elements make up the core?
- Nickel
2. Iron
The measure of a fluid’s such as lava, resistance to flow?
Viscosity
The chemical compound silicon dioxide,SiO2,which is common ingredients in most magma?
Silica
Tends to be small, heights in the hundreds of meter range, and have short eruptions cycles?
Cinder cone Volcanoes
board,flat structures composed of layer upon of lava flows?
Shield Volcanoes
Large and steep-sided,often thousands of meters high and tens of kilometers across the base, and composed of layer of both lava and ash
Composite Volcanoes
What is molten, or liquid, rocks that is stored in earth called?
Magma
Where is the Ring of Fire located?
Pacific ocean
What form when tectonics plate collide along subduction zones?
Volcanoes
What two specific locations have volcanic activity due to divergent
1,East-African rift valley
2.Mid Atlantic ridge
Are hot spots stationary?
Yes
what are created by hot spots
Islands ex: Hawaii islands
If a viscosity is high is it going to flow slower of faster?
Slower
If magma has a high viscosity is it going to have more or less silica?
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