the whole-mantle model of mantle convection says

material from core/mantle rise forming mantle plumes

The truth about paleomagnetism

when rocks form, they show the magnetic pole at the time

what evidence supports Wegener

fossils of same organisms found on different continents

according to theory of plate tectonics

lithosphere is divided into plates

What is NOT evidence of seafloor spreading

distribution of ice sheets on Earth

what causes the thermal convection that drives plate motion

differences in temperature and density

Evidence of ancient climates indicates that

glaciers once covered India and Australia

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Chapter 9 Earth Science

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Plate Tectonics

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Questions 20

Answers

1
the theory of continental drift states that all the continents once formed
2 supercontinents and 3 smaller continents
1 major supercontinent
3 major supercontinents
2 major supercontinents
2
A convergent occurs where
Red sea and Africa meet
N. American plate meets Pacific plate
India and Asia meet
U.S. meets Canada
3
the whole-mantle model of mantle convection says
material from core/mantle rise forming mantle plumes
small amounts of the mantle move upward to the surface
large parts of continental crust are pulled down into mantle
slabs of oceanic crust move down into the lower mantle
4
The truth about paleomagnetism
a major shift in polarity occurred 1 mya
rocks possess specific polarity depending on where it forms
all rocks have the same polarity
when rocks form, they show the magnetic pole at the time
5
geographical example of a transform boundary
Mariana Arc
Mid-Atlantic Ridge
East African Rift
San Andreas Fault
6
continental drift is used to explain an event that happened about
2 bya
2 mya
2 hundred bya
2 hundred mya
7
divergent boundary at two continental plates
rift valley
volcanic arc
island arc
mountain range
8
what evidence supports Wegener
same mammal species exist on different continents
fossils of same organisms found on different continents
land bridges still connect continents
major rivers on different continents match
9
according to theory of plate tectonics
asthenosphere is strong and rigid
asthenosphere is divided into plates
lithosphere is divided into plates
asthenosphere moves over lithosphere
10
downward sliding characteristic of ridge-push is the result of
paleomagnetism
uneven heat distribution
gravity
seafloor spreading
11
Main source of downward convection movement in the mantle
ridge-push
slab-pull
slab-push
ridge-pull
12
What is NOT evidence of seafloor spreading
polarity reversals in the seafloor
relationship b/n earthquakes and plate bounndaries
analysis of seafloor sediments
distribution of ice sheets on Earth
13
types of boundary when plates grind past each other (no lithosphere destroyed)
divergent
convergent
transform
transitional
14
What forms when once oceanic plate is forced beneath another plate
ocean ridges
a rift valley
a subduction zone
an ocean basin
15
What happens when divergence occurs within the oceanic lithosphere
a mountain range
a rift valley
seafloor spreading
a volcano chain
16
what causes the thermal convection that drives plate motion
subduction
seafloor spreading
gravity
differences in temperature and density
17
Evidence of ancient climates indicates that
no continents were found in N. hemisphere
countries in N. hemisphere once covered south pole
countries in S. hemisphere once covered the north pole
glaciers once covered India and Australia
18
average movement of lithospheric plates
5 cm/year
5 in/year
50 cm/year
50 in/year
19
What does NOT happen at a subduction zone
both plates are bend downward
oceanic crust is pushed down into mantle
oceanic plate moves into another oceanic plate
on continental plate moves into an oceanic plate
20
Islands of Java and Sumatra are examples of
hot spot
rift zones
island arc
an ocean ridge

Chapter 9 Earth Science Flashcards | StudBud