Chapter 6 Science Test (7th Grade)

Question	Answer
Lithenosphere	part of the crust and the upper mantle
Asthenosphere	plastic like layer that moves
Plate	part of the lithosphere that moves on the asthenosphere
Convergent boundary	two plates that move together
Divergent boundary	two plates that move apart from each other
Transform Boundary	two plates that slide past each other
Mid Ocean Ridge	forms where two oceanic crust divides and may also rise to form a volcanic island
Convection Current	cycle of heating, rising, cooling, and sinking
Pangea	the supercontinent suggested by Wegener in his theory
State the theory of Continental Drift	The theory of Continental Drift is that the continents were together as Pangea and slowly drifted apart.
Scientists studying the ocean floor found ___ bands of magnetism	Scientists studying the ocean floor found the alternative bands of magnetism.
Plates of the lithosphere float on the ____	Plates of the lithosphere float on the asthenosphere.
Seafloor spreading occurs because _____	Seafloor spreading occurs because molten material beneath Earth's crust rises to the surface.
Plate motion is caused by _______ inside the Earth	Plate motion is caused by convection currents inside the earth.
The hypothesis that continents have slowly moved to their current locations is called _____	The hypothesis that continents have slowly moved to their current locations is called continental drift.
In order to complete a convection current, warm mamga ____ then ____ back into the Earth	In order to complete a convection current, warm magma rises then syncs back into Earth.
How fast are the plates moving?	The plates move about 1 centimeter per year fast.
What feature is formed where two oceanic plates collide?	The feature is formed where two oceanic plates collide is the subduction zone.
Where are the youngest rocks on the ocean floor located?	The youngest rocks on the ocean floor located are in the middle of the ocean.
What results from the collision between two continental plates?	The results from the collisions between two continental plates are mountains.
Why does the hot, plastic like rock in the asthenosphere rise toward the Earth's surface?	The hot, plastic like rock in the asthenosphere rise toward the Earth's surface because as hot plastic like material cools, it becomes denser.
How long ago did Wegener believe that the continents originally broke apart about?	Wegener believed that the continents originally broke apart about 220 million years.
What makes up the lithosphere compromised of?	The lithosphere is compromised of rocks in the crust and upper mantle that behave as brittle solids.
Explain why continents float higher than the crust of the ocean.	Continents float higher than the crust of the ocean because the continents are less dense than the ocean.
Explain some of the other evidence used to support the hypothesis of continental drift.	Some of the other evidence used to support the hypothesis of continental drift is that fossils and rocks of the same kind were found in difference continents, such as the Mesosaurus fossil found in South America, and Africa, and similar rocks found in USA, Greenland, and Western Europe, Eastern South, and Western Africa.
Why was Wegener's hypothesis rejected?	He did not have a mechanism for how the movement would occur.

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Chapter 6 Science Test (7th Grade)

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