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Vocabulary
Structure of the Earth
Notes
Plate Tectonics
Earthquake
100
The thinnest layer of the Earth
What is the crust
100
There are ______________ main layers of the Earth.
What is four
100

What is the term for underwater mountains? 

What is a ridge

100
Earthquakes and Volcanoes are usually located in relation to these
What is a plate boundary
100

Geologists use seismic waves to locate and earthquake's _____

What is Epicenter

200
A number of rigid, but moving, pieces of Earth's surface
What is tectonic plates.
200

What layer of earth's interior is liquid?

What is outer core

200

How do plate tectonics move?

What is convection currents

200
The mid-ocean ridge is an example of a ____________________ boundary and ___________________ occurs here where new ocean floor is formed.
What is divergent boundary; sea-floor spreading
200

What are the fastest seismic waves that can travel through solids, liquids, and gases called?

What is P Waves

300
The theory that all continents are fragments of Pangaea now drifting apart
What is the Continental Drift Theory
300
Plates float on top of the _______________________.
What is the asthenosphere
300

What type of plate boundaries does seafloor spreading occur at? 

What is a divergent boundary

300

What is the name of the plate that we live on?

What is  North American plate

300

A huge undersea earthquake off the Alaskan coastline could produce a

What is a tsunami

400

States that youngest rocks of ocean floor are at divergent boundaries, moving outward

What is seafloor spreading

400
The rigid part of the Earth including the crust and the upper mantle (makes up the plates of the Earth)
What is the lithosphere
400

What type of plate boundary are trenches found at?

What is convergent 

400
This is the mechanism (what causes) the plates to move
What is convection cycles in the mantle
400

How long would it take for the first S-wave to arrive at a seismic station 4,000 kilometers away from the epicenter of an earthquake?

What is 12 min 40 sec 

500
Although the hottest layer of the Earth, this layer is solid metal
What is the inner core
500
The Earth's crust is thinnest under the _____________________ and thickest under the _____________________.
What is thinnest under the ocean and thickest under the continents.
500

What causes the stripes of iron on the floor? 

What is magnetic pole reversal

500
The two types of convergent boundaries
What is subduction (where volcanoes often occur) and collision (where mountains are usually formed)
500

The epicenter of an earthquake is 6,000 kilometers from an observation point. What is the difference in travel time for the P-waves and S-waves?

What is 7 min 35 sec