WorksheetsContinental Drift and Seafloor spreading
Total questions: 45
Worksheet time: 2hrs 30mins
What did Wegener name the large supercontinent where all the continents were joined together?
Wegenerland
Gondwanaland
Laurasia
Pangaea
Most geologists rejected Wegener's idea of Continental Drift because _________.
He used too many pieces of evidence to support the idea.
He wanted to know what Earth looked like millions of years ago, which is impossible.
They were afraid of the new idea.
He couldn't identify "how" continents to move around.
Wegener used the fit of the continents as evidence to support his hypothesis of Continental Drift.
True
False
Wegener used matching mountain ranges across different continents as evidence to support his hypothesis of Continental Drift.
True
False
Wegener used evidence of glaciers in places now too warm as evidence to support his hypothesis of Continental Drift.
True
False
Wegener used matching fossils of the same organisms on different continents as evidence to support his hypothesis of Continental Drift.
True
False
What were 2 kinds of evidence were used to prove that the seafloor spread?
Rock formations AND WWII shipwrecks,
Magnetic seafloor stripes AND WWII ship logs
Magnetic seafloor stripes AND Age of rock samples
What technology was used during WWII to detect enemy submarines and produce the first map of the seafloor?
Sonar
Radiam
GPS
Process by which new ocean crust forms.
Seafloor spreading
Continental drift
Mid-ocean ridge
Rift
The zone where one plate slides under another is called the
Convergent zone
Subduction zone
Transform zone
Mantle zone
Undersea mountain ranges are called a_________.
Rift
Mid-ocean ridge
Seafloor spreading
Continental drift
Wegener used matching rock types and ages across different continents as evidence to support his hypothesis of Continental Drift.
True
False
Wegener used evidence of convection currents in the mantle as evidence to support his hypothesis of Continental Drift.
True
False
The OLDEST seafloor is located?
Closest to the mid-ocean ridge
Farthest from the mid-ocean ridge
Sea-floor spreading begins at the
Deep ocean trench
Mid-ocean ridge
Continent's edge
Why does oceanic crust (density 3ish) sink below the continental crust (density 2.6ish) during subduction
Oceanic crust is less dense
Oceanic crust is more dense
Oceanic crust is warmer
Oceanic crust is older
Wegener's idea of Continental Drift was rejected by geologists because _________.
He used too many pieces of evidence to support the idea.
He wanted to know what Earth looked like millions of years ago, which is impossible.
He couldn't identify how or even why the continents to moved around.
They were afraid of the new idea.
Who came up with the theory of seafloor spreading?
Harry Hess
Alfred Wegener
Who is the person credited with developing the theory of continental drift?
Harry Hess
Alfred Wegener
What are the two types of crust?
Continental AND Oceanic
Lower AND Upper
Ocean AND Basin
Tick AND Thin
Younger sea floor crust is located...
Farther from the mid-ocean ridges
At the mid ocean ridges
Near the continents
Older crust is found towards the...
Mid-ocean ridge
Deep-ocean trench
Asthenosphere
What causes the crust to move?
Convection currents
Conduction
Tension
Radiation
Why were magnetic patterns found on the ocean floor puzzling?
They showed alternating bands of iron pointing north and south.
No rocks were magnetic.
They did NOT show alternating bands of iron pointing north and south.
What is label C
Trench
Mid-ocean ridge
Abyssal plain
Sea mountains
What are Mid-Ocean Ridges?
A chain of underwater waterfalls.
A chain of underwater mountains where the magma oozes out.
A chain of underwater rocks.
Which is NOT evidence of sea-floor spreading?
Molten magma constantly erupting.
Drilling samples of rock
Magnetic stripes
Fossil evidence
What is label A?
Trench
Mid-ocean ridge
Abyssal plain
Continental shelf
What do you call the evidence of Wegener's Theory that tells about the remains of an organism that lived long time ago?
Ashes
Follicles
Bones
Fossils
What causes continents to move?
Seafloor speading
Convection currents swirling
Magma oozing out of a mid-ocean ridge
all listed
Our continents will eventually become a supercontinent (like Pangaea) again, far in the future
True
False
What is the rate at which the Atlantic Ocean is expanding?
5-10 cm per year- like how our fingernails grow
5-10 feet per year
5-10 km per year
The plates will never stop moving
True
False
Alfred Wegener proposed his theory of Continental Drift in the early 20th century. Why did scientists refuse to believe him?
He was not a REAL scientist.
He could not explain HOW the plates moved.
Scientists did not think his evidence was real.
Which layer of Earth contains the tectonic plates?
Crust AND the Uppermost Mantle
Lower AND Middle Mantle
Outer Core
Inner Core
What is this image trying to show?
How the shape of the continents match.
Rock evidence showing that the continents were connected.
Fossil evidence suggesting that the continents were connected.
The force in the MANTLE that makes the plate move is called...
Convection Currents
Conduction
Radiation
During WWII the navy mapped the ocean floor with _______.
A robotic rover
Radiation evidence
Sonar waves
Seismic waves
Where would the oldest rock be found?
L
M
N
O
The average density of continental crust is 2.8 g/cm3 and the average density of oceanic crusts is 3.2 g/cm3. If these two plates came together, what would happen?
The two plates would push apart and form a rift zone.
The oceanic plate would rise up over the continental plate.
The oceanic plate would sink under the continental plate.
The two plates would meet head on and rise up to form mountains.
Seafloor spreading...
creates new oceanic crust.
destroys or recycles crust.
creates new continental crust.
creates old crust.
Wegener used evidence of convection currents in the mantle as evidence to support his hypothesis of Continental Drift.
True
False
Why does oceanic crust sink below the continental crust during subduction?
Oceanic crust is less dense
Oceanic crust is more dense
Oceanic crust is older
Oceanic crust is warmer
What types of evidence did Wegener use to support the theory of Continental Drift? (Select ALL answer that are correct)
Evidence from land features
Evidence from animal fossils
Evidence from plant fossils
Evidence from ancient climates
Evidence from human remains
The crust and upper mantle make up Earth's ____.
Asthenosphere
Lithosphere
Mesosphere
Core
