EarthQuakes
This wave travels faster, records a lower signal strength, and causes less damage.
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What is the 'p' wave?
The thinnest layer of the Earth
What is THE CRUST
This is the under-laying (plastic-rock) flowing layer which allows the earth's plates to move.
What is the Asthenosphere?
Earthquakes and Volcanoes are usually located in relation to these.
What is a plate boundary.
This type of seismic wave causes the most damage.
What are 's' waves?
An Earthquake in City A registers 5.6/City B 7.8/City C 6.8. Which city had the strongest earthquake?
What is City B?
A number of rigid, but moving, pieces of Earth's surface
What is TECTONIC PLATES
This is the rigid upper layer of the earth which includes the earth's crust and upper most mantle.
What is the lithosphere?
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.
This physical layer is divided into pieces called tectonic plates.
What is the lithosphere?
This wave travels slower, records a stronger signal strength, and causes more damage.
What is the 's' wave.
The theory that all continents are fragments of Pangaea now drifting apart.
What is THE CONTINENTAL DRIFT THEORY
This is the total number of plates known on earth.
What is around 20?
Name four of the major plates
What is any of the the following Eurasian Plate, Australian plate, North American plate, South American plate African plate, Antarctica plate.
What is the chain of over 300 active volcanoes around the Pacific Ocean known as?
What is The Ring of Fire
An involuntary quivering movement.
What is Tremor
States that youngest rocks of ocean floor are at diverging boundaries, moving outward.
What is SEAFLOOR SPREADING
This is the average distance the earth's plates move per year.
What is 1 inch / year?
This is the mechanism (what causes) the plates to move.
What is convection cycles in the mantle
Name 1 positive effect of a volcano.
What is Creation of new islands or rock for roads/buildings
A sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
What is a EarthQuake
Although the hottest layer of the Earth, this layer is solid metal.
What is the inner core
What is THE INNER CORE.
These are the two types of crust found on earth and their densities and thicknesses?
What is continental crust (less dense, but thicker) and oceanic crust (more dense, but thinner)?
The two types of convergent boundaries
What is subduction (where volcanoes often occur) and collision (where mountains are usually formed)
What are large, continent sized blocks of crust known as?
What is Tectonic plates