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30 Cards in this Set
- Front
- Back
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Cinder cone
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A steep, cone-shaped hill or mountain made of volcanic ash, cinders, and bombs, piled up
around a volcano's opening. |
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Composite volcano
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A tall, cone-shaped mountain in which layers of lava alternate with layers of ash and
other volcanic materials. |
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Index Fossils
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Fossils of widely distributed organisms that lived during only one short period.
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Shield Volcano
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A wide, gently sloping mountain made of layers of lava and formed by quiet eruption.
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Unconformity
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A place where an old, eroded rock surface is in contact with a newer rock layer.
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Epicenter
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The point on Earth's surface directly above an earthquake's focus.
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Focus
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The point beneath Earth's surface where rock breaks under stress and causes an earthquake.
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P Wave
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A type of seismic wave that compresses and expands the ground.
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S Wave
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A type of seismic wave that forms when P waves and S waves reach Earth's surface.
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Surface Wave
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A type of seismic wave that forms when P waves and S waves reach Earth's surface.
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Absolute Age
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The age of a rock given as the number of years since the rock formed.
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Era
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One of the three long units of geologic time between the Precambrian and the
present. |
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Law of Superposition
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The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it.
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Pangaea
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The name of the single landmass that broke apart 225 million years ago and gave rise to today's continents.
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Radioactive Decay
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The breakdown of a radioactive element, releasing particles and energy.
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Cinder cone
|
A steep, cone-shaped hill or mountain made of volcanic ash, cinders, and bombs, piled up
around a volcano's opening. |
|
|
Composite volcano
|
A tall, cone-shaped mountain in which layers of lava alternate with layers of ash and
other volcanic materials. |
|
|
Index Fossils
|
Fossils of widely distributed organisms that lived during only one short period.
|
|
|
Shield Volcano
|
A wide, gently sloping mountain made of layers of lava and formed by quiet eruption.
|
|
|
Unconformity
|
A place where an old, eroded rock surface is in contact with a newer rock layer.
|
|
|
Epicenter
|
The point on Earth's surface directly above an earthquake's focus.
|
|
|
Focus
|
The point beneath Earth's surface where rock breaks under stress and causes an earthquake.
|
|
|
P Wave
|
A type of seismic wave that compresses and expands the ground.
|
|
|
S Wave
|
A type of seismic wave that forms when P waves and S waves reach Earth's surface.
|
|
|
Surface Wave
|
A type of seismic wave that forms when P waves and S waves reach Earth's surface.
|
|
|
Absolute Age
|
The age of a rock given as the number of years since the rock formed.
|
|
|
Era
|
One of the three long units of geologic time between the Precambrian and the
present. |
|
|
Law of Superposition
|
The geologic principle that states that in horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it.
|
|
|
Pangaea
|
The name of the single landmass that broke apart 225 million years ago and gave rise to today's continents.
|
|
|
Radioactive Decay
|
The breakdown of a radioactive element, releasing particles and energy.
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