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Earth Science
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8th grade Earth Science
Flashcards
25 cards
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Practice quiz
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Host live
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Questions
25
Answers
1
The time it takes for half of a radioactive isotope to decay into a stable isotope is it's ....
radio-life
extinction
whole-life
half-life
2
Which would be considered evidence for
continental drift
?
mountains and rock layers
all of the above
fossil correlation
"puzzle" shape of continents
3
What is happening at mid-ocean ridges?
Sea-floor spreading occurs.
Tectonic plates are colliding.
The crust is crumbling.
Oceanic lithosphere is being destroyed.
4
Absolute Dating
is using radiometrics to find the exact age of rocks using radioactive decay.
False
True
5
The Law of Superposition states....
Big rocks will turn into little rocks.
Younger rocks lie above older rocks (if undisturbed)
All rocks are old.
Rock layers always stay the same.
6
Magma from below intruding into layers of rock, forms younger rock and is called _____________.
Intrusions
crust
geologic column
erosion
7
What causes the
weathering
of rocks?
heat
all of the above
wind
water and ice
8
What is
relative dating?
Using a lab to pinpoint the exact age of something.
Constructing a family timeline.
When you're kind of going out with someone.
Comparing the ages of rocks using the law of Superposition.
9
How does oceanic crust differ from continental crust?
It's less dense and thinner than continental crust.
It's thinner and more dense than continental crust.
It's less dense and blue in color.
It's thicker and more dense than continental crust.
10
Where do
most
earthquakes and volcanoes occur?
In the ocean
Along tectonic plate boundaries.
11
Which layer of Earth is liquid?
The outer core.
The mantle.
The inner Core.
The crust.
12
Define, Isotope.
A frozen atom.
An atom with different number of neutrons than protons.
A fashion accessory.
An unusually large atom.
13
Most
earthquakes and volcanoes occur in the middle of a tectonic plate.
False
True
14
Deposition is the process of dropping off or laying down sediment.
TRUE
FALSE
15
How do we know what the Earth's interior is like?
From studying fossil patterns.
From studying seismic waves from earthquakes.
From studying magnetic reversals in the oceanic crust.
By using GPS.
16
Which
era
is known as
The Age of Reptiles?
The Mesozoic Era
The Cenozoic Era
The Paleozoic Era
17
Movement
of weathered rock, soil or sediment is called...
deposition
erosion
weathering
intrusion
18
The death of ALL members of a species.
Extinction
Fossil
Endangered
Emergency Exit
19
How many
millions
of years old is the Earth?
4,600 million years
half a million years
4.2 million years
9,800 million years
20
Plate boundary formed by the collision of two tectonic plates....
normal plate boundary
transform fault boundary
convergent plate boundary
divergent plate boundary
21
What is a
fossil
?
Trace or remains of an organism that lived long ago.
A type of forest plant.
A fancy purse or watch.
Your Science teacher.
22
The
most dense
state of matter is....
plasma
liquid
solid
gas
23
What happens at divergent plate boundaries?
Oceanic plates drop.
Heat from Earth's core causes mantle plumes.
Hot spots cause volcanoes.
Tectonic plates move apart.
24
The best way to measure the speed tectonic plates move ....
centimeters per year
feet per year
kilometers per year
meters per year
25
The soft layer of the mantle on which the tectonic plates move.
Lithosphere
Crust
Asthenosphere
Mesosphere
