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What percent of the Earth does the mantle take up?
80%
What elements are in the Earth’s inner core?
Iron and Nickel
How do tectonic plates move?
Float on top of the asthenosphere due to convection currents in the mantle
What happens at a subduction zone?
More dense oceanic plate dives beneath less dense continental plate
What do plates do at a transform boundary?
Slide past each other
How often do the Earth’s magnetic poles reverse?
Every 200,000 years
Energy travels in earthquakes as ________ _______
Seismic waves
Is a longitudinal wave a P wave or an S wave?
P wave
What type of wave can not travel through liquids?
Transverse or S waves
What does a seismograph measure?
Location of the epicenter of an earthquake
What does the Richter scale measure?
The amount of energy that an earthquake releases
What is seismology?
The study of earthquakes
What type of volcanoes have only violent explosions?
Cinder Cone
What is the Ring of Fire?
An area in the Pacific Ocean with frequent earthquake and volcanic activity
What are records of seismic activity called?
Seismograms
What type of fault is found at a transform boundary?
Strike-slip
What type of volcano is the steepest?
Composite
What type of volcano has only mild eruptions?
Sheild
Which layer of the Earth is the most dense?
The core
What scientist proposed the theory of continental drift?
Alfred Wegner
What layer of the Earth is the thinnest?
Crust
An earthquake starts at the ______ beneath the Earth’s surface.
Focus
Does an earthquake with a shallow focus or one with a deeper focus cause the most damage? Explain.
Shallow, the Earth absorbs some of the energy
What is the asthenosphere?
Liquid portion of the mantle