Chapter 25.3 and 25.4 Flashcards
What is the boundary that marks the density change between layers
Discontinuity
How are dincontinuities identified
By using seismic waves
What is a shadow zone
An area where no seismic waves have been recorded
What is another term for shadow zone
Dead zone
What are the degrees that shadow zones fall between
105 and 140 degrees
Is the outer core a solid or a liquid
Liquid
Is the inner core a solid or a liquid? Why?
It is a solid because the pressure
What makes up the lithosphere
The crust and uppermost mantle
What is the asthenosphere
Plastic-like layer where plates move on
What elements make up the mantle
Calcium, Aluminum, Iron, and Magnesium
What elements make up the core
Iron and Nickel
the measure of a fluids resistance to flow
Viscosity
the chemical compound silicon dioxide which is a common ingredient in most magma
Silica
small, have heights in the hundred of meters range and have short eruption cycles
Cinder Cone Volcanoes
broad flat structures composed of layer upon layer of lava flows
Shield Volcanoes
large steep-sided, 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 rock stored inside the Earth?
magma
Where is the ring of fire located?
Pacific Ocean
What forms when tectonic plated collide along subduction zones?
Volcanoes
What two specific locations have volcanic activity due to divergence
East African Rift Valley and the Mid-Atlantic ridge.
Are hot spots stationary
Yes
What are created form hot spots
islands (Hawaiin 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
More silica
