Continental Drift / Plate Tectonics Flashcards
The convection currents are found in the ______________________ of the Earth.
asthenosphere
The Earth’s magnetic fields are created by the ____________________ core.
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Ocean crust is made of ________________ rock and
continental crust is made of ____________________ rock.
basalt
granite
Scientist know about the Earth’s interior by studying ____________________ (earthquake) waves.
seismic
Wegener believed that millions of years ago the Earth’s continents were joined into a land mass called _________________.
pangaea
Ancient organisms preserved in rock are called ___________________.
fossils
List the types of evidence that Wegener used to support his Continental Drift Theory.
a. ________________________________________
b. ______________________________________________
c. ______________________________________________
d. ______________________________________________
fossils
puzzles
climate change
coal fields
The longest chain of mountains on Earth are found on the ocean floors and are called _______
mid-ocean ridge
Why did most geologists rejected Wegener’s theory?
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If two plates come together, a ____________________ boundary is formed.
covergent
Scientists were able to “see” the mid-ocean ridge by using ____________________.
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Lava flows from the mid-ocean ridge and creates ___________________________.
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Scientists discovered that rocks farther away from the mid-ocean ridge were_____________ than those rocks near the ridge.
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A _______________________ zone is created when ocean floor sinks into a trench and melts back into the mantle.
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Explain why seafloor spreading explained continental movement.
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_____________________________________ is the theory that pieces of the Earth’s crust called plates are in constant motion.
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Converging boundaries on two continental plates will create __________________.
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A rift-valley is created by _______________________ boundary on land.
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As some plates collide and some plates separate, they will form ________, __________ and ocean basins.
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The youngest rocks in the ocean would be found at _________________________.
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Of the following, which would not be evidence of plate movement?
volcanoes mid-ocean ridges earthquakes mountains rivers trenches
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The _________________________________ mountains are formed when the Indian plate collides with the Eurasian plate.
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Continental Drift is caused by convection currents and ___________________________.
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Rocks on the ocean floor are (younger, same age, older) than continental rocks.
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When plates slide past one another, which of the following happens?
volcanoes earthquakes trenches mid-ocean ridges rift valleys mountains
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What surface event helps scientist to study the Earth’s interior?
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Ocean floor rocks are _________________ than continental rocks.
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What is magnetic reversal?
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Cracks that form on plates as they are stretched and pulled by plate movement are called___________. What is the very active earthquake zone in California called? _____________
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Ocean currents can affect the ___________________ of nearby land.
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What is upwelling?
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What 2 factors create Density Currents?
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Waves and currents are caused by _______________.
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List 2 geological features or events that happen at each of these boundaries.
Transform boundary
Convergent boundary
Divergent boundary
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Why will an ocean plate sink beneath a continental plate?
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At what location on the sea floor would you find a subduction zone?
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