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Plate Boundaries, Continental Drift and Seafloor Spreading
Plate Boundaries, Continental Drift and Seafloor Spreading
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Plate boundaries, Continental drift and seafloor spreading for Grade 10
Flashcards
30 cards
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Questions
30
Answers
1
The process by which molten material adds new oceanic crust to the ocean floor is called?
The seafloor cracking apart
Seafloor Spreading
ocean growing
Deep Ocean trenching
2
Who proposed the theory of sea-floor spreading?
H. Howard
H. Hess
H. Alfred
A. Wegener
3
What causes the plate tectonics?
conduction
convection
radiation
tension
4
What geological features will form between continental and oceanic convergent?
trench and continental volcanic arc
rifting valley and ridge
trench and island arc volcanoes
mountain range and high plateau
5
The crust of the earth is made mostly of
molten iron and nickel
iron and nickel
nitrogen and oxygen
oxygen and silicon
6
True or False? Sea-floor spreading is faster than subduction.
True
False
7
The
oldest
seafloor is located _____?
closest to the mid-ocean ridge
farthest from the mid-ocean ridge
8
Iceland experiences what type of plate boundary?
Continental-Continental Convergent
Oceanic-Oceanic Convergent
Oceanic-Oceanic Divergent
Continental-Continental divergent
9
When two continental plates diverge, what geological feature is formed?
rift valley
mountain range
earthquake
subduction zone
10
What was the name given to the "super continent"?
Gondwana
Pangaea
Laurasia
Papua New Guinnea
11
Of which locations can you find the most active volcanoes?
Indian Plate
Philippine Plate
Pacific Plate
Eurasian Plate
12
Which 2 continents have mountain ranges with similar rock & structure, used as evidence of CD?
Australia and India
Africa and South America
North America and Russia
South America and India
13
Lithospheric plates are made up of
upper and lower mantle
inner and outer core
continental and oceanic crusts
crust and uppermost mantle
14
What do the lines in our model stand for?
sonar readings
magnetic stripes
longitude and latitude
trench
15
What evidence helps scientists show how sea floor spreading occurs?
drilling samples
ocean floor material
magnetic stripes
all of the above
16
One of a geological feature that happens when there is subduction
asthenosphere
rifting
mid-ocean ridge
trench
17
Which is
NOT
evidence of sea-floor spreading?
drilling samples of rock
molten magma constantly erupting
fossil evidence
magnetic stripes
18
What two continents fit together most noticeably and were evidence for the original theory?
Antarctica and Africa
South America and Africa
South America and Europe
Africa and North America
19
Who is the person credited with developing the theory of continental drift?
A. Wegener
R. Dietz
A. Einstein
H. Hess
20
Wegener could not explain ____________________.
what made the continents move
how climates changed
how oceans were created
the size of the continents
21
The process which more dense crust sinks beneath less dense crust and band back into the mantle
sea-floor spreading
subduction
mid-ocean ridge
22
New crust is always formed at the ____
trench
asthenosphere
ridge
hot spot
23
The fern-like plant fossil Wegener discovered was called ________________
Mesosaurus
Glossopteris
Cynognathus
Lystrosaurus
24
What is sonar?
A device used by scientists to map mid-ocean ridges.
A device used by scientists to map seafloor spreading.
A device that is used to create mid-ocean ridges.
25
What happens to oceanic plate when it subducts?
It partially melts due to the high temperature
It solidifies due to its greater density
It solidifies due to its thickness
It partially melts due to the high pressure
26
Sea-floor spreading begins at the___.
epicenter
ridge
asthenosphere
trench
27
In sea-floor spreading, where does the new crust come from?
molten material
sun
glaciers
solid material
28
It states that Earth's lithosphere are in constant, slow motion driven by mov't in the mantle
The Theory of Pangaea
Plate Tectonics Theory
Plate Boundaries Theory
Continental Drift Theory
29
True or False? The Pacific Ocean is shrinking.
True
False
30
A freshwater reptile fossil found by Wegener was called ________________.
Mesosaurus
Cygnognathus
Glossopteris
Reptosaraus
