25.3 & 25.4 Flashcards
What is the boundary that marks a density change between layers?
Discontinuity
How are discontinuities identified?
Seismic Waves
What are shadow Zones?
Areas where no seismic waves are recorded
What is another term or name for Shadow Zone?
Dead Zone
Between what degrees do Shadow Zones fall?
105-140 degrees
Is the outer core a solid or a liquid?
Liquid
Is the inner core a solid or a liquid?
Solid, because of so much pressure.
What makes up the lithosphere?
- Crust
2. Uppermost mantle
What is the asthenosphere?
Plastic like layer which Earth´s plates move.
What elements make up the mantle?
- Calcium
- Aluminium
- Iron
- Magnesium
What makes up the core?
- Iron
2. Nickel
What is the measure pf fluid´s resistance to flow?
Viscosity
What is the chemical compound that is silicon dioxide?
Silica
What kind of volcanoes tend to be small, have heights in the hundreds of meters range, and have short eruption cycles?
Cinder Cone Volcano
What kind of volcanoes are broad, flat structure composed of layer upon layer of lava flow?
Shield Volcano
What kind of volcanoes are large and steep-sided, often thousands of meters high and tens of kilometres across the base, and composed of layers of both lava and ash?
Composite Volcano
What is the sources for molten material inside Earth?
magma