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plate boundaries
lithosphere and asthenosphere
volcanoes
Sea-Floor Spreading
earthquakes
100
A boundary where earthquakes occur
What is convergent plate boundaries
100
made up primarily of basalt
What is oceanic crust
100
are tall and broad, with flat, rounded shapes
What is shield volcanoes
100
The process by which molten material adds new oceanic crust to the ocean floor.
What is sea-floor spreading?
100
crack in Earth's surface
What is faults
200
located where plates are moving away from each other
What is divergent plate boundaries
200
made up of granite
What is continental crust
200
are tall, symmetrically shaped, with steep sides, sometimes rising 10,000 feet high
What is composite volcanoes
200
The undersea mountain chain where new ocean floor is produced, a divergent plate boundary
What is the mid-ocean ridge?
200
dips away from the uplifted crustal block
What is Normal ault
300
two plates slide past one another
What is transform plate boundaries
300
surrounds the core and has a thickness of 2900 kilometers
What is the mantle
300
is molten rock that spews from an erupting volcano
What is lava
300
The process by which oceanic crust sinks through a deep-ocean trench and back into the mantle; a convergent plate boundary.
What is subduction?
300
dips beneath the uplifted crustal block
What is reverse fault?
400
When two oceanic plates collide, the younger of the two plates, because it is less dense, will ride over the edge of the older plate.
What is suduction plates
400
is theorized to be solid with a density of about 13 grams per cubic centimeter and a radius of about 1220 kilometers
What is inner core
400
molten rock underground
What is magma
400
A device that determines the distance of an object under water by recording echoes of sound waves.
What is a sonar?
400
Crustal blocks slide past each other
What is Strike-slip fault
500
float on the surface of the Earth’s mantle
What is oceanic plates
500
is liquid and has a density of about 11 grams per cubic centimeter
What is outer core
500
is a volcanic rock which is exploded from a vent in fragments less than 2mm in size
What is volcanic ash
500
A deep valley along the ocean floor through which oceanic crust slowly sinks towards the mantle.
What is a deep-ocean trench?
500
builds up and the rocks slips suddenly
What is stress?