Plate Tectonics
Layers of Earth
Volcanoes and Earthquakes
Sea-Floor Spreading
Continental drift
100
Plate tectonics move about a _____ inch to _____ inch.
About a half inch to 4 inch
100
What is the hottest layer of the earth?
What is the inner core
100
Earthquakes and volcanoes occur along the edges of ______ _______.
What is plate tectonics
100
Who created the theory of sea-floor spreading?
Who is Herman Hess
100
Who thought of the theory of continental drift?
Who is Wegener
200
There are more than 300 volcanoes around the Pacific Plate. These volcanoes are known as the _____ __ ______. It is called the _____ __ _____ because there are so many volcanoes around the edges of the Pacific Plate.
What is the Ring of Fire
200
What is the layer of the Earth that we live on?
What is the Crust
200
True or False? Earthquakes and Volcanoes occur along the edges of tectonic plates?
True
200
What goes on at mid-ocean ridges?
What is sea-floor spreading or The youngest rocks of the sea floor are forming in the middle at the rift between the ridges or Magnetic striping has been observed. The Earth’s magnetic field reverses itself Every few thousand years
200
Why was continental drift NOT accepted?
Continental drift was not accepted because Wegener couldn't explain what force was strong enough to move the plates
300
The Earth is split into ______ to ______ major plates.
What is seven to twelve
300
What are the three layers?
What is crust, mantle, inner core, outer core
300
What is an Earthquake
What is 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.
300
Who proposed that the movement of the continents was a result of sea-floor spreading?
Who is Herman Hess
300
What is continental drift
What is the gradual movement of the continents across the earth's surface through geological time.
400
Scientists believe that at one time all the continents were joined together to form a supercontinent called______?
What is Pangeae
400
The crust and the upper layer of the mantle together make up a zone of rigid, brittle rock called the ______?
What is granite and basalt
400
What is volcano?
What is a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.
400
What was the proof of Sea-Floor Spreading?
Ancient magnetism records flip-flops of earth’s magnetic field or The Age of the Sea Floor Oceans are youngest at the Mid-Ocean ridges and oldest near the continents or New ocean floors are created at mid-ocean ridges. And ocean floors are destroyed in subduction zones.
400
How do plate tectonics move?
By spreading apart, sliding by. or colliding into each other
500
What is plate tectonics?
The theory that Earthś outer shell is divided into several plates that glide over the mantle, the rocky inner layer above the core
500
What two rocks is is the crust composed of?
What is granite and basalt?
500
How does a volcano erupt?
What is Magma rises through cracks or weaknesses in the Earth's crust. When this pressure is released, eg as a result of plate movement, magma explodes to the surface causing a volcanic eruption. The lava from the eruption cools to form new crust. Over time, after several eruptions, the rock builds up and a volcano forms.
500
In 1953, American physicists Ewing and Heezen discovered that through an underwater mountain range ran a deep canyon. In some places the canyon, called the _____ _____ _____, came very close to land.
What is the great global rift
500
When did Pangaea began to break apart?
Pangaea began to break apart millions of years ago. (300 millions years ago)
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