Convection currents occur

When hot (less dense) substances rise, and cooler (denser) substances sink

Convection Currents are

rising & sinking of magma (hot material)

What happens at the subduction zone?

The denser plate is forced underneath the less dense plate ?

What is the difference between Magma, and Lava?

Magma is underground, and Lava has broken through the Earth's surface

idea of whole earth being together

How do magnetic reversals suggest the seafloor is spreading?

The seafloor alternates in magnetic polarity

Bounces sound waves off structures and records how long it takes

Where does Earth's magnetic field come from?

the metal inner core of the Earth

What are the 3 types of evidence Alfred Wegener used to support his theory?

fossils, climate change, land features

The Earth has a magnetic field

True - flowing from the poles and flips polarity over time

How is it possible for new crust to be formed without increasing the surface area of the earth?

Crust is destroyed at the same time it is created

Why wasn't continental drift widely accepted by other scientists?

Wegener couldn't explain why or how they moved

transform boundary are what

two plates sliding past each other

thinner, more dense, younger crust making ocean floor

According to plate tectonic theory, what happens when two continental plates collide?

The plates converge, the crust pushes upward makes mountains

What is the correct order of Earth's layers?

crust - mantle - outer core - inner core

A convergent boundary between a Continental and Oceanic plate will result in...

The denser oceanic plate dives under the Continental plate

What is a mid ocean ridge?

seafloor mountain system formed by tectonic plates

What is the definition of seafloor spreading?

the theory of a new seafloor formed when magma is forced up to the ocean.

How does slab pull contribute to plate movement?

Gravity helps pull the plate near the subduction zone into the mantle

How does the asthenosphere move?

it flows very slowly and is malleable, like silly putty or ooblek

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Plate Tectonics Review

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Questions 40

Answers

1
Convection currents occur
When hot (less dense) substances rise, and cooler (denser) substances sink
When hot (less dense) substances sink, and cooler (denser) substances sink
When hot (less dense) substances sink, and cooler (denser) substances rise
When hot (less dense) substances rise, and cooler (denser) substances rise
2
What happens at a divergent plate boundary?
Volcanoes
Hot spots
Geysers
Water
3
Convection Currents are
water and rock currents
Magnetic field
rising & sinking of magma (hot material)
moon waves
4
Continental crust is made of what rock type?
granite
shale
obsidian
basalt
5
What happens at the subduction zone?
Magma is collected?
Both plates are forced upwards (folding)?
The denser plate is forced underneath the less dense plate ?
Magma rises through cracks in the Earth's surface?
6
What is the difference between Magma, and Lava?
Magma is hot, and Lava is cooled
Magma is underground, and Lava has broken through the Earth's surface
Magma is a liquid, whereas lava is a solid
There is no Difference
7
This occurs at mid-ocean ridges when the oceanic lithosphere slides downhill due to gravity.
transform boundaries
slab pull
convergent boundaries
ridge push
8
How old is the oldest ocean floor?
240 million yrs
4.6 billion yrs
5000 million yrs
180 million yrs
9
Pangea
idea that there is 7 earths
idea that we dont really exist
idea of whole earth exploading
idea of whole earth being together
10
The process of ___continually adds new crust to the ocean floor along the mid-ocean ridge
continental drift
seafloor spreading
convection
plate tectonics
11
What is the probable cause for Earth's magnetic field?
Metal within the core
Metal atop the crust of the Earth
Liquid metal in the outer core
12
How do magnetic reversals suggest the seafloor is spreading?
All the rocks on the seafloor are polarized south
All the rocks on the seafloor are polarized north
The seafloor alternates in magnetic polarity
The seafloor is entirely demagnetized
13
How does SONAR work?
Records time it takes for UV waves to travel to structures
Uses a combination of data from sound and light waves
Uses lasers to estimate distance to the sea floor
Bounces sound waves off structures and records how long it takes
14
What are the main causes of convection currents in the asthenosphere?
coffee and creamer
gravity and mass
temperature and density
humidity and magnetism
15
With seafloor spreading, rock is moved away from a mid-ocean ridge. What replaces the rock as it moves away?
Compacted sediment
Older rock
Molten rock
Continental crust
16
What causes the lithospheric plates of Earth to move?
pangaea
conduction
elasticisty
convection
17
Where does Earth's magnetic field come from?
the north and south poles
Earth's atmosphere
the metal inner core of the Earth
Stop & Shop
18
What are the 3 types of evidence Alfred Wegener used to support his theory?
land features, animals, plants
climate change, land features, maps
fossils, rock samples, seismic waves
fossils, climate change, land features
19
The lithospheric plates float on top of the ____.
Outer Core
Inner Core
Asthenosphere
Crust
20
The Earth has a magnetic field
True - flowing from the poles and flips polarity over time
False
True - flowing from the poles and forever constant
True - flowing from the equator
21
At what type of plate boundary does subduction occur?
Convergent
Divergent
Transform
Spreading
22
How is it possible for new crust to be formed without increasing the surface area of the earth?
New crust is underwater where it sinks
Crust is destroyed at the same time it is created
New crust breaks more easily than old crust
All of the above
23
A complete opposite change in the Earth's magnetic field
Magnetic polarity
Magnetic reversals
Superposition
24
Why wasn't continental drift widely accepted by other scientists?
the land masses are too big to move over Earth's surface
magnetic and sonar evidence
Wegener couldn't explain why or how they moved
mantle convection currents werent' in motion
25
Continental Crust stays on top of oceanic crust because it is ______.
Equally dense
More dense
Less Dense
Made of Basalt
26
How were the Hawaiian islands formed?
Oceanic-oceanic convergent zone
Hot spot
Volcanoes
Divergent zone
27
transform boundary are what
two plates saidaing post each ather
cooling magma
when two plates meet
two plates sliding past each other
28
In convection currents the cooler denser fluid
stays on top
sings to the bottom
stays where it is
rises to the top
29
Oceanic crust
it is generally older and more complex than the oceanic crust
the relatively thick part of the earth's crust that forms the large land
thinner, more dense, younger crust making ocean floor
Theory that earth's lithosphere is in constant motion
30
Where is oldest ocean crust?
G
D
C
B
31
the closer you get to the mid ocean ridge the ________ the rocks age gets
younger
same
my dogs name was changed to chupacabra last night
older
32
The upwelling of mantle material at mid-ocean ridges is caused by tectonic plates and comes from
terranes
the asthenosphere
the lithosphere
rift valleys
33
According to plate tectonic theory, what happens when two continental plates collide?
The plates converge and create rift zones
The plates converge, the crust pushes upward makes mountains
The plates diverge and create mid-ocean ridges
The plates converge, one plate subducted under the other
34
What is the correct order of Earth's layers?
crust - mantle - outer core - inner core
crust - outer core- inner core-mantle
outer core - inner core - crust - mantle
mantle - outer core - inner core - crust
35
A convergent boundary between a Continental and Oceanic plate will result in...
Sea floor spreading
Mid-ocean ridges and underwater volcanoes
The two plates moving in the same direction
The denser oceanic plate dives under the Continental plate
36
What is a mid ocean ridge?
I dont know
lava pool formed by tectonisc plates
seafloor mountain system formed by tectonic plates
volcano formed by tectonic plates
37
What is the definition of seafloor spreading?
the instrument used to measure earthquake waves and record them
the process of studying the ocean/world to gain knowledge.
the theory of a new seafloor formed when magma is forced up to the ocean.
38
Ocean trenches form where....
continental plates subduct under ocean plates.
ocean plates subduct.
ocean plates move side by side.
continental plates collide.
39
How does slab pull contribute to plate movement?
It forms tsunamis
It causes convection currents in the mantle
Gravity helps pull the plate near the subduction zone into the mantle
Gravity helps push the plate near the ridge away from the ridge
40
How does the asthenosphere move?
it is rigid, like the lithosphere
it is very liquid-like and flow like water
does not move at all
it flows very slowly and is malleable, like silly putty or ooblek

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