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Our Changing Earth Flashcards | StudBud
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Our Changing Earth
Our Changing Earth
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StudBud Administration
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Our earth is constantly changing..... #dynamic#onthemove#giantpuzzle
Flashcards
10 cards
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Practice quiz
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Questions
10
Answers
1
The __________ of a rock is its age compared to the ages of other rocks.
definite age
absolute age
estimate
relative age
2
at which boundary do two plates pull apart?
convergent
divergent
transform
mantle-crust
3
What about an extrusion is not true?
an extrusion is always older than the rocks below it
Lava that hardens on the surface and forms igneous rock
to determine relative age, geologists study extrusions.
4
Why are the oldest parts of the ocean floor no older than about 200 million years?
The sea life around it eats away at it
sea floor spreading adds more crust to the ocean floor
ocean floor sinks back into mantle at deep ocean trenches
5
Why are index fossils useful?
they tell relative age of rock layers in which they occur
they look neat in the rock layers
They are not found everywhere
Helps scientists match layers to determine age.
6
The law of superpositon states.....
in sedimentary rock layers the oldest layer is at the bottom
Rocks are created and destroyed by rock cycle
fossils tell us stories of the past
the grand canyon has lots of sandstone
7
What type of boundary is created when two continental crusts collide and form mountain ranges?
Rift Valley
Transform
Convergent
Continental
8
In which areas does subduction of the ocean floor take place?
mid-ocean ridge
deep-ocean trenches
rift valleys
the lower mantle
9
When heating up soup on the stove, what is actually taking place?
Conduction
Radiation
Convection
Density
10
What type of boundary do you see in this picture
earthquake
convergent
divergent
transform
