WorksheetsUnit 2 - Earth History
Total questions: 32
Worksheet time: 19mins
Name
Class
Date
1.
What proof do scientist use to argue that seafloor spreading has been happening for a long time?
a)
Magnetic pole reversals visible in ocean floor crust
b)
Carbon dating from each pole
c)
Radiometric dating samples from ridge
d)
There is no proof, they just have a theory about it.
2.
Why is the oldest ocean floor located near the continents?
a)
Sublimation - the continents get pulled under.
b)
Transformation; older crust gets pushed under the continental shelf
c)
The oldest ocean floor is NOT located near the continents.
d)
Subduction; Mid ocean ridge creates new crust and pushes old crust outward.
3.
Which plates are older, continental or oceanic?
a)
Continental
b)
Oceanic
c)
They are the same age
d)
It is unknown at this time
4.
Which plates are more dense, continental or oceanic?
a)
Continental
b)
Oceanic
c)
They are the same density
d)
It is unknown at this time
5.
What percentage of a uranium sample would still remain after one half life?
a)
100%
b)
50%
c)
25%
d)
10%
6.
What is absolute dating of rocks?
a)
Dating rocks with an absolute/approximate age
b)
Rocks seeking out other cute rocks
c)
Giving rocks a time era or epoch
d)
Dating rocks with an exact (or range of) age
7.
What is relative dating of rocks?
a)
Dating rocks with an exact (or range of) age
b)
Dating rocks in reference to other rocks or objects
c)
Dating rocks based on color or chemical composition
d)
Cute rocks looking for other cute rocks to spend time with
8.
What does it mean if an element is radioactive?
a)
It is stable because it has balanced activity
b)
It is unstable because it has too many or too few neutrons
c)
It is unstable because it has an odd number of atoms
d)
It is unstable because it has lost one or more nuetrons
9.
What is a convergent boundary?
a)
Where plates diverge or spread apart from each other
b)
Where plates converge or come together
c)
Where plates slide along each other
d)
Where plates crash into each other and form volcanoes
10.
What are the 3 types of convergent boundaries?
a)
Oceanic-Oceanic, Continental-Continental & Oceanic-Continental
b)
Oceanic, Continental & Convergent
c)
Oceanic-Oceanic, Continental-Oceanic & Sea Floor Spreading
d)
There is only one type of convergent boundary
11.
What is a transform boundary?
a)
Where plates diverge or spread apart from each other
b)
Where plates come together
c)
Where plates crash into each other and form volcanoes
d)
Where two plates slide past each other
12.
What landforms are created at a divergent boundary?
a)
Mid-ocean ridge and Rift Valley
b)
Mid-ocean ridge
c)
Rift Valley
d)
Volcanoes & Riptides
13.
What is a divergent boundary?
a)
Where plates diverge or spread apart from each other
b)
Where plates come together
c)
Where plates slide along each other
d)
Where plates crash into each other and form volcanoes
14.
What landforms are created at a convergent boundary?
a)
Rivers & Lakes
b)
Mid-ocean ridge and Rift Valley
c)
Oxbow lakes
d)
Volcanoes and Mountains
15.
What happens at transform boundaries?
a)
Volcanoes
b)
Earthquakes
c)
Mid-ocean rift
d)
Strong currents
16.
What is subduction?
a)
plates sliding side by side
b)
plates forming volcanoes
c)
plates folding in on each other
d)
one plate sliding under another
17.
Who came up with the idea of seafloor spreading?
a)
Harry Hess
b)
Alfred Wegener
c)
Kathryn Stegeman
d)
Alfred Hess
18.
Who was the first to suggest the idea of continental drift?
a)
Alfred Hess
b)
Harry Hess
c)
Alfred Wegener
d)
None of the above
19.
What evidence was there for continental drift?
a)
Old photos
b)
Pangaea
c)
Convection Currents
d)
Fossils & Mineral deposits
20.
What does the theory of plate tectonics say?
a)
Volcanoes & Earthquakes are caused because the Earth is aging
b)
Earth's crust is floating and constantly moving, ever so slowly
c)
Plate technicians believe the continents will slowly crumble
d)
This theory has been debunked
21.
What force causes tectonic plates to move?
a)
Global warming
b)
Time
c)
Convection currents
d)
Wind
22.
What is the ring of fire? And where is it found?
a)
Where there are lots of earthquakes & volcanoes - Pacific Ocean
b)
Where the ocean floor is spreading - Atlantic Ocean
c)
Where forest fires impact humans - Northeast quadrant of Earth
d)
Where there are lots of volcanoes - Hawaiian Islands
23.
How can we find plate boundaries?
a)
Where mountain ranges have formed
b)
Where volcanoes & earthquakes appear often
c)
Where the ocean floor is spreading and creating new boundaries
d)
By studying rocks & fossils
24.
What is a bathymetric map?
a)
Shows how high mountains and ridges are
b)
Shows where earthquakes are likely
c)
Shows the depth of oceans or water
d)
Shows where volcanoes are likely
25.
What are two ways to show elevation on both bathymetric and topographic maps?
a)
Color & Legend
b)
Color & Coding
c)
Coding & images
d)
Color & images
26.
What are the two different methods of dating?
a)
Relative & Radiometric
b)
Bathymetric & Radiometric
c)
Relative & Bathymetric
d)
Relative & Absolute
27.
If a radioactive sample started out with 200g of radioactive material, how old is the sample if there is only 25g of radioactive material left and the half life is 200 years?
a)
425 years old
b)
175 years old
c)
600 years old
d)
800 years old
28.
If we start with 240 atoms of a radioactive element with a half life of 2000 years, how much would remain after 6000 years?
a)
30 atoms
b)
40 atoms
c)
60 atoms
d)
80 atoms
29.
If 25% of a radioactive element with a half life of 600 million years remains, how old is the sample?
a)
300 million years old
b)
600 million years old
c)
800 million years old
d)
1200 million years old
30.
How long would it take 100 g of a radioactive element with a half life of 13 seconds to decay to 6.25 g?
a)
6.5 seconds
b)
24 seconds
c)
52 seconds
d)
75 seconds
31.
Describe the processes occurring at a mid ocean ridge.
a)
What is the type of plate movement/boundary?
b)
What is created?
c)
What happens to the old seafloor?
d)
What happens when the old seafloor meets the continental crust?
32.
Describe the processes occurring at a subduction zone.
a)
Where do subduction zones occur?
b)
Why does the ocean plate sink below the continental crust?
c)
Where is this recycled?
d)
What major events form in subduction zones?
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