题目内容
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The 1 plates of the Earth are formed from _______.
A．the oceanic crusts and continental crusts
B．the crusts and the mantle
C．the crusts and the top and solid part of the mantle
D．the continental crusts and the solid part of the mantle
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更多“The 1 plates of the Earth are …”相关的问题
The 1 plates of the Earth are formed from ______.
A．the oceanic crusts and continental crests
B．the crusts and the mantle
C．the crusts and the top and solid part of the mantle
D．the continental crusts and the solid part of the mantle
根据下列材料，请回答题
A Very Slow Ride
The surface of the earth may seem very stable to you. But you might be amazed if you knew some of the things that are going on under that surface.
The earth has an outer shell of rigid pieces called tectonic plates （地壳构造板块）. The plates include both ocean floor and dry land. Some have whole continents on top of them. The continents on top of the plates are just going along for a slow ride， moving only about four inches per year. But even this small movement causes three types of big interactions.
One type is ocean ridges. These ridges develop in places where two plates are moving away from each other. As the plates separate， hot magma（岩浆） flows up to fill the space. New crust（地壳） builds up on the plate boundaries and causes ocean ridges. These ridges form. long mountain ranges， which only rise above the ocean surface in a few places.
Another type of reaction——trenches——occurs between two plates that are moving toward each other. As the plates meet， one bends downward and plunges underneath the other. This forms deep ocean trenches. The Marianas Trench off Guam in the western Pacific Ocean has a depth of more than 36，000 feet. This is the lowest point on the ocean floor. If the leading edges of the two colliding plates carry continents， then the layers of rock in the overriding plate crumple（变皱） and fold. A plate that carried what is now India collided with the southern edge of the plate that carried Europe and most of Asia. This caused the Himalayas， the world"s highest mountains.
The third reaction is transform. faults（转换断层）. These faults occur where two plates that are traveling in opposite directions slide past each other. Severe earthquakes can occur. The San Andreas Fault in California is a good example of this type of movement.
The word "stable" （paragraph 1 ） means 查看材料
A."a place for horses"
B."calm and easygoing"
C."steady or firm"
D."a collection of animals"
The reason why the electric eel is able to give more powerful shock is that ______.
A．the working system of the electric plates in the eel is the most effective
B．the working system of the electric plates in the eel is far inferior to those in the torpedo
C．compared with those in the torpedo, the working system of electric plates in the eel is more direct and efficient
D．compared with other electric fish, the eel possesses much more electric plates
Seriously-deformed zones appear ______.
A．whenever the crusts move over mantle
B．when the plates move towards each other
C．in the narrow boundaries where two plates meet
D．to be the major topographical feature of the Earth
A.The brother has three plates
B.My brother has three plates
C.I have three brothers
The reason why the electric eel is able to give more powerful shock is that______.
A．the working system of the electric plates in the eel is the most effective
B．the working system of the electric plates in the eel is far inferior to those in the torpedo
C．compared with those in the torpedo, the working system of electric plates in the eel is more direct and efficient
D．compared with other electric fish, the eel possesses much more electric plates
Seriously-deformed zones appear _______.
A．whenever the crusts move over mantle
B．when the plates move towards each other
C．in the narrow boundaries where two plates meet
D．to be the major topographical feature of the Earth
We ______ down when a waitress ______ plates of food for us.
A) had hardly sat / had brought B) hardly sat / brought
C) hardly sat / had brought D) had hardly sat / brought
The San Andreas Fault is an example of 查看材料
A.a severe earthquake
B.a California rock formation
C.two plates moving apart
D.two plates sliding past each other
We could not pull apart two plates which ______ a vacuum, unless we spend great strength.
A．removed
B．substituted
C．enclosed
D．replaced
