what technology did scientists NOT use to develop the theory of seafloor spreading?

GPS (Global Positioning System)

What do scientists believe is the force behind the theory of plate tectonics?

convection currents in the mantle

circulation of materials due to diffs. in temp and density

what is magnetic reversal?

when the magnetic field reverses direction

What is a transform boundary?

Two plates sliding along each other

What is a divergent boundary?

Two plates moving away from each other

what is a convergent boundary

two plates moving towards each other

what is a mid ocean ridge

mountain ranges in the middle of the ocean

studbud

Sea floor spreading

18 termsStudBud Administration150 plays

#science #grade7 quiz #seafloorspreading #platetectonics #continentaldrift

Flashcards18 cardsFPractice quizPHost liveL

Questions 18

Answers

1
True or False: Basalt contains iron rich magnetic minerals
False
True
2
what technology did scientists NOT use to develop the theory of seafloor spreading?
Seafloor thickness measurements
Magnetometer measurements
Echo sounding measurement
GPS (Global Positioning System)
3
What do scientists believe is the force behind the theory of plate tectonics?
the moon
the movement of planets
convection currents in the mantle
the sun
4
What is the cold and rigid outermost rock layer?
Asthenosphere
Lithosphere
Mantle
coldsphere
5
What is convection
ocean tide patterns
Cold air moving around
clouds about to rain
circulation of materials due to diffs. in temp and density
6
what is magnetic reversal?
reversed polarity
when the magnetic field reverses direction
seafloor spreading
a type of sandwich
7
Is continental drift a fast or slow process?
Fast
Slow
8
The name of the scientist who proposed the continental drift hypothesis
Bill Nye
Alfred Wegener
Albert Einstein
Mr. Rozanski
9
What can be used as an indicator of past climate?
lava
fossils
Sandwiches
tides
10
What is the name for when all the continents where joined as one super continent
algae
pangea
dinosaur land
Disney world
11
what clue supported the continental drift theory?
fossils of animals + plants on continents separated by ocean
similar rock structures on different continents
all of the above
A puzzle like fit of all the continents
12
What is a transform boundary?
two plates moving away from each other
two plates moving towards each other
none of these
Two plates sliding along each other
13
A state where magnetized objects point north
normal polarity
23
reversed polarity
science
14
oceanic crust forms where?
at mid ocean ridges
by magnetic reversal
on an abyssal plain
everywhere
15
What is a divergent boundary?
none of these
two plates sliding past eachother
Two plates moving away from each other
Two plates sliding along each other
16
what is a convergent boundary
two plates moving towards each other
Two plates moving away from each other
none of these
Two plates sliding along each other
17
what is a mid ocean ridge
the location of a cave full of pretzels
sandwich
mountains on the moon
mountain ranges in the middle of the ocean
18
when magnetized objects point south
23
science
normal polarity
reversed polarity

Sea floor spreading Flashcards | StudBud