What Wegener knew
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what are the boundaries?
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100
the name of the supercontinent that existed millions of years ago
What is Pangaea?
100
What technology did scientists use in the mid-1900s to map the mid-ocean ridge?
What is sonar
100
The lithosphere is broken into sections called ____________________, which float on top of the asthenosphere.
What is plates
100
The place where two plates come together is known as a
What is convergent boundary
100
Which type of plate boundary occurs at X?
What is divergent boundary
200
Which type of evidence was NOT used by Alfred Wegener to support his continental drift hypothesis?
What is a. evidence from landforms b. evidence from fossils c. evidence from human remains d. evidence from climate
200
In sea-floor spreading, molten material rises from the mantle and erupts
What is along mid-ocean ridges.
200
The formation of volcanoes and mountain ranges can be explained by the theory of _________________________.
What is plate tectonics
200
A collision between two pieces of continental crust at a converging boundary produces a
What is mountain range.
200
Which type of plate boundary occurs at Y?
What is convergent boundary
300
The hypothesis of _________________________ was that all the continents once were joined as a single supercontinent and have since drifted apart.
What is Continental Drift
300
What did scientists in a submersible see when they observed the mid-ocean ridge?
What is rocks formed by the rapid hardening of molten material
300
The lithosphere is broken into sections called ____________________, which float on top of the asthenosphere.
What is plates
300
A place where two plates slip past each other, moving in opposite directions, is known as a
What is transform boundary.
300
Identify the three plates in the diagram.
What is Plate A and C are oceanic crust, Plate B is continental crust.
400
To support his hypothesis, Alfred Wegener provided evidence from ____________________, traces of ancient organisms preserved in rock.
What is fossils
400
How did scientists discover that rocks farther away from the mid-ocean ridge were older than those near it?
What is by determining the age of rock samples obtained by drilling on the sea floor
400
Mid-ocean ridges are
What is found in all of Earth’s oceans.
400
A rift valley forms at a
What is divergent plate boundary
400
What feature occurs at Y, and how does it form?
What is At Y, a deep-ocean trench is forming. The oceanic crust is denser and plunges beneath the continental crust, forming a trench.
500
Most geologists rejected Alfred Wegener’s idea of continental drift because
What is Wegener could not identify a force that could move the continents.
500
The ocean floor sinks beneath a deep-ocean trench and back into the mantle in a process known as ____________________.
What is subduction
500
Most geologists think that the movement of Earth’s plates is caused by
What is convection currents in the mantle
500
According to the theory of plate tectonics, which layer of the earth is broken into separate sections called plates?
What is lithosphere
500
What is happening at Z?
What is The edge of plate B is plunging beneath plate C and melting in the mantle
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