Vocabulary
Sea-Floor Spreading
Plate Tectonics
Volcanoes
Earthquakes
100
Name of the single landmass or supercontinent that joined the continents together about 300 million years ago.
What is Pangea?
100
Old oceanic crust is cooler than new oceanic crust and sinks to the ocean floor because it is more _________.
What is dense?
100
The geological theory that states that pieces of Earth's lithosphere are in constant, slow motion.
What is the Theory of Plate Tectonics?
100
Lava before it reaches the Earth's surface.
What is magma?
100
The shaking and trembling that happens from the movement of rock beneath the Earth's surface.
What is an earthquake?
200
Any trace of an ancient organism that was preserved in rock.
What is a fossil?
200
Scientists used this new technology in the mid-1900s to map the mid-ocean ridge.
What is sonar?
200
The movement of Earth's plates is caused by this driving force in the mantle.
What is convection currents?
200
The main hazard from a quiet volcanic eruption.
What is lava flows?
200
The point directly above the focus of an earthquake.
What is an epicenter?
300
A record of an earthquake's seismic waves.
What is seismogram?
300
These landforms are created as a result of molten material rising from the mantle and erupting along the sea-floor.
What are mid-ocean ridges?
300
The place where two plates slip past each other, moving in opposite directions.
What is transform boundary?
300
Two general locations where volcanoes are most likely to occur.
What is mid-ocean ridges & subduction zones? OR... Ring of Fire and Hot Spots?
300
Geologists locate epicenters by analyzing ______ ______.
What is seismic waves?
400
A belt of volcanoes that circles the Pacific Ocean.
What is the Ring of Fire?
400
During subduction, the oceanic crust plunges below the continental crust and is pulled back into the ___________.
What is the mantle?
400
A series of landforms resulting in the collision of two converging continental plates.
What is mountain range?
400
The main difference between quiet and explosive volcanic eruptions.
What is silica content of the magma?
400
These seismic waves produce the largest reading on a seismograph.
What is surface waves?
500
The process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle again.
What is subduction?
500
The process that occurs when oceanic crust plunges below the continental crust because it is more dense.
What is subduction?
500
This scientist proposed the hypothesis of continental drift.
Who is Alfred Wegener?
500
The force that causes magma to erupt to the surface.
What is trapped or dissolved gases in the magma?
500
Places earthquakes appear most often.
What is plate boundaries?
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