The SFS lab shows the oldest ocean rocks are about 180 myo. This tell us the Earth's age is?

the Earth must be at least 180 myo

Why didn’t Wegener use data from the Mid Ocean Ridge when developing Continental Drift Theory?

Wegener knew nothing about the ocean floor or the MOR

The Theory of Sea-Floor Spreading states: Ocean floor is being . . .

formed at the MOR and the oceans are getting bigger

How did active volcanoes all along the MOR change how geologists thought about Earth?

Earth may not be completely solid inside

What do geologists infer from the middle of the MOR being warmer than the edges?

the mountains of the MOR are active volcanoes

Why was the discovery of rift valleys on the top of the Mid-Ocean Ridge so important?

it showed that the MOR is pulling apart

What does the pattern of ages in the ocean floor rocks indicate to geologists?

ocean floors form at the MOR and then spread apart

Why was World War II important to the science of geology and our knowledge of the Earth?

the MOR was discovered with SONAR, invented during the war

The speed data from the Sea Floor Spreading lab are very similar. What may we infer from this?

the rate of SFS remains constant over long periods of time

Why was finding rocks on the ocean floor with alternating magnetic orientations important?

it shows Earth’s magnetic poles reversed many times

How is the Theory of Continental Drift similar to the Theory of Sea Floor spreading? Both . . .

make a prediction about how the Earth works

Which of the following statements is true? SFS replaced CD because . . .

it explained how the continents were moving

If you examine the ocean floor 600km west and 600 km east of the MOR, how would they compare?

same age and the same magnetic orientation

How are the theories of Continental Drift and Sea Floor Spreading different?

CD explains moving continents, SFS expanding ocean floors

The MOR extends into Africa between the Arabian Peninsula. What can be inferred?

Arabia is beginning to split away from the rest of Africa

Utah Valley is a great analogy of the rift valleys on the Mid-Ocean Ridge. Why is this?

both are formed by the Earth’s crust being pulled apart

What is the major flaw in the Theory of Sea Floor Spreading?

it cannot explain how basalt can keep coming from the mantle

How does SFS data show, the Earth preserves evidence of past changes and conditions?

all of these are evidences of past changes on Earth

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Sea Floor Spreading

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Sea Floor Spreading Review

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Questions 26

Answers

1
The SFS lab shows the oldest ocean rocks are about 180 myo. This tell us the Earth's age is?
the Earth cannot be any more than 180 myo
it is not possible to determine the age of the Earth
the Earth must be at least 180 myo
the Earth cannot be more than 6000 years old
2
Which important part of the Earth’s crust is created at the Mid-Ocean Ridge?
Continental Crust
Ocean Crust
Mantle
Inner Core
3
Why didn’t Wegener use data from the Mid Ocean Ridge when developing Continental Drift Theory?
Wegener didn’t know valid theories need data
because his theory deals with continents
Wegener chose to ignore that data because he didn’t like it
Wegener knew nothing about the ocean floor or the MOR
4
The Theory of Sea-Floor Spreading states: Ocean floor is being . . .
being destroyed at the MOR and the oceans are getting bigger
destroyed at the MOR, and the oceans are getting smaller
formed at the MOR and the oceans are getting smaller
formed at the MOR and the oceans are getting bigger
5
Name #27
Oldest Rock
Youngest Rock
Mid-Ocean Ridge
Continent
6
Name #25
Mid-Ocean Ridge
Continent
Fault block Mountains
Rift Valley
7
How did active volcanoes all along the MOR change how geologists thought about Earth?
Earth was less than 6000 years old and still forming
Earth may not be completely solid inside
using data to do science is not a good idea
SFS must be an incorrect theory because of volcanoes
8
What do geologists infer from the middle of the MOR being warmer than the edges?
there must be some volcanoes that can erupt cold lava
the mountains of the MOR are active volcanoes
the inside of the earth must be cold and solid
the continents rubbing together at the MOR produces heat
9
Why was the discovery of rift valleys on the top of the Mid-Ocean Ridge so important?
it showed that the MOR is pulling apart
Wegener predicted it was there before it was actually found
it is the location of the lost continent of Atlantis
it is the source of important petroleum supplies
10
What does the pattern of ages in the ocean floor rocks indicate to geologists?
all ocean floors are just old buried pieces of continents
the youngest rocks are near beaches on the continents
pillow lavas can form anywhere in the oceans at any time
ocean floors form at the MOR and then spread apart
11
Why was World War II important to the science of geology and our knowledge of the Earth?
geology was invented during the war
all of the bad geologists died in combat
the Nazis were against geology
the MOR was discovered with SONAR, invented during the war
12
The speed data from the Sea Floor Spreading lab are very similar. What may we infer from this?
the rate of SFS remains constant over long periods of time
the Atlantic Ocean floor formed very quickly
all of Earth’s rocks are about the same age
there were navigational errors aboard the DSDP/ODP ships
13
Name #23
Rift Valley
Oldest Rock
Continent
Mid-Ocean Ridge
14
Why was finding rocks on the ocean floor with alternating magnetic orientations important?
it shows when Earth spins, all magnets point north
it proves the Earth’s outer core was solid
it proves that magnets will work under water
it shows Earth’s magnetic poles reversed many times
15
How is the Theory of Continental Drift similar to the Theory of Sea Floor spreading? Both . . .
were accidental discoveries with no data to back them up
accurately predicted how new parts of the Earth are formed
make a prediction about how the Earth works
predict that new ocean floors are being formed at the MOR
16
Name #26
Mid-Ocean Ridge
Continent
Rift Valley
Fault block Mountains
17
Which of the following statements is true? SFS replaced CD because . . .
SFS was invented before CD by Alfred Wegener
it explained how the continents were moving
SFS was invented before CD, explaining continents moving
it was developed by real geologists
18
If you examine the ocean floor 600km west and 600 km east of the MOR, how would they compare?
same age, but a different magnetic orientation
different age but the same magnetic orientation
different age and a different magnetic orientation
same age and the same magnetic orientation
19
How are the theories of Continental Drift and Sea Floor Spreading different?
SFS says that the Earth is young, CD says the Earth is old
CD explains moving continents, SFS expanding ocean floors
CD explains oceans growing, SFS oceans decreasing
SFS was proposed by real scientists, CD by a non-scientist
20
Where are the oldest pieces of ocean crust found?
at the MOR
close to volcanoes
next to the continents
on Pangaea
21
The MOR extends into Africa between the Arabian Peninsula. What can be inferred?
the MOR is the largest mountain range on the planet
global warming is causing Earth’s crust to expand and spli
Pangaea is in the process of coming back to together
Arabia is beginning to split away from the rest of Africa
22
Utah Valley is a great analogy of the rift valleys on the Mid-Ocean Ridge. Why is this?
both are visible from space
Utah Valley has nothing in common with the MOR
both valleys have the same number of people living in them
both are formed by the Earth’s crust being pulled apart
23
What is the major flaw in the Theory of Sea Floor Spreading?
it cannot explain how basalt can keep coming from the mantle
it cannot explain how a continent can move
it is not based on real data
nothing- it is a perfect theory
24
What is the name of the theory which states that many ocean basins are slowly getting wider?
Continental Drift
Sea Floor Spreading
Evolution
Plate Tectonics
25
How does SFS data show, the Earth preserves evidence of past changes and conditions?
MOR mountains are fault-blocks, showing stretching
Magnetic direction is preserved in ocean floor basalt
pillow lavas in Wyoming show it used to be an old MOR
all of these are evidences of past changes on Earth
26
Name #24
Mid-Ocean Ridge
Rift Valley
Continent
Youngest Rock

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