Show:
Continental Drift
Plate Tectonics
Earth's Interior
Convergent Plate Boundaries
Volcanoes
100
Wegner believed the Earth's continents were once joined in Earth's past to form one massive supergiant called ________________.
What is Pangea?
100
This theory that attempts to explain the movements of the Earth's lithosphere that have formed the landscape features we see across the globe today.
What is the "Plate Tectonic Theory?"
100
The Earth is made up of four layers that differ in ______________, ______________, and _____________.
What are density, temperature, and composition?
100
Two tectonic plates _____________ at a convergent plate boundary.
What is converge?
100
Most of the Earth's volcanoes are located around the __________ ________ ____ ______ because that the location of most of the Earth's subduction zones.
What is the Pacific Ring of Fire?
200
Alfred Wegner's theory of Continental Drift Theory was not accepted by the Scientific community because Wegner could provide a mechanism for _______ ______ _________ ______________.
What is "how the plates moved?"
200
There are three main driving forces for the movement of the Earth's tectonic plates. They are mantle _____________, gravity and the Earth's rotation. There are large _____________ currents of molten material in the Earth's upper mantle.
What is convection?
200
The Earth's Crust is broken up into two major types of Crust: ____________________ and _______________ crust.
What are continental and oceanic?
200
A _______________ ____________ forms when two different tectonic plates collide into each other.
What is a subduction zone?
200
In Iceland, one volcanic eruption can trigger another due to ________________ that carry magma over large distances.
What are fissures?
300
Wegner observedthat the continents in the southern hemisphere exhibit an identical pattern of rock formations and fossils known as the "Gondwana sequence" supporting the hypothesis that the _____________ __________ ___________________.
What is "the continents fit together?"
300
New material is added to the ocean floor at these divergent plate boundaries through the process known as _____________ ______________. This was discovered when scientists studied the Mid-Ocean Ridge and the Mariana Trench.
What is seafloor spreading?
300
Different regions of the mantle have different temperatures. The region closer to the __________ ___________ has higher temperatures than regions closer to the ______________.
What are the "outer core" and "crust?"
300
At a subduction zone, one plate sinks under the other tectonic plate due to having a greater ______________.
What is density?
300
______________ igneous rocks form from magma cooling on the Earth's Crust. Since these rocks have less time to cool, there is not enough time for ___________ crystals to form.
What are "extrusive" and "larger?"
400
Fossil remains of a prehistoric reptile known as the Mesosaurus had been uncovered on both sides of the South Atlantic, yet the creature was no great swimmer. There was no evidence of ______________ _____________ for these land animals to move from one continent to the other at their current positions.
What are "land bridges?"
400
_____________ ________________ do not contribution to the direct construction or destruction of the Earth's Crust as tectonic plates slide horizontally against one another.
What are Transform boundaries?
400
There are two main zones are distinguished in the upper mantle: the inner ________________ composed of plastic flowing rock and the lowermost part of the _______________ composed of rigid rock.
What are asthenosphere and lithosphere?
400
When two oceanic tectonic plates of the same density collide into each other, both will be lifted up and form features like _______________ _____________ ________.
What are volcanic island arcs?
400
Iceland has many volcanic eruptions due to it's placement on top of the _________________ _____________.
What is the mid-ocean ridge?
500
Plant fossils indicated that ___________ __________ once existed only a few hundred miles from the North Pole.
What are plant fossils?
500
Older seafloor is found closer to the _______________ ___________________ as seafloor gets pushed farther away from the Mid-Ocean Ridges where new molten magma come up through the ridge.
What are continental margins?
500
The pattern of sea floor spreading can be observed by studying the magnetic field of the rock on the sea floor. At the mid-ocean ridge, magma rises up from the mantle below and cools. As it continues to cool, iron in the rock aligns itself with the ____________ _____________ of the Earth, much like the needle in a compass. When the rock solidifies, this magnetic “signature” is locked in place.
What is the magnetic field?
500
When two continental tectonic plates collide, neither will subduct due to their relatively low density and produce landforms such as ___________________.
What are mountains?
500
Lava, ______________ material, ash, and gases are released from a volcano during a volcanic eruption,
What is pyroclastic?