Continental Drift / Plate Tectonics Flashcards
(36 cards)
The convection currents are found in the ______________________ of the Earth.
asthenosphere
The Earth’s magnetic fields are created by the ____________________ core.
…
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?
…
If two plates come together, a ____________________ boundary is formed.
covergent
Scientists were able to “see” the mid-ocean ridge by using ____________________.
…
Lava flows from the mid-ocean ridge and creates ___________________________.
…
Scientists discovered that rocks farther away from the mid-ocean ridge were_____________ than those rocks near the ridge.
…
A _______________________ zone is created when ocean floor sinks into a trench and melts back into the mantle.
…
Explain why seafloor spreading explained continental movement.
…
_____________________________________ is the theory that pieces of the Earth’s crust called plates are in constant motion.
…
Converging boundaries on two continental plates will create __________________.
…
A rift-valley is created by _______________________ boundary on land.
…
As some plates collide and some plates separate, they will form ________, __________ and ocean basins.
…
The youngest rocks in the ocean would be found at _________________________.
…
Of the following, which would not be evidence of plate movement?
volcanoes mid-ocean ridges earthquakes mountains rivers trenches
…
The _________________________________ mountains are formed when the Indian plate collides with the Eurasian plate.
…
Continental Drift is caused by convection currents and ___________________________.
…
Rocks on the ocean floor are (younger, same age, older) than continental rocks.
…