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Alva Science 7th Grade Earth History Unit 3 Flashcards | StudBud
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Alva Science 7th Grade Earth History Unit 3
Alva Science 7th Grade Earth History Unit 3
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1
Which describes two kinds of trace fossils?
Bee and beetle in amber
Petrified and mummified fossils
Shells and bones
Tracks and burrows
2
What is a key characteristic of index fossils?
Similar to other fossils
Existed in a unique location
Exist for a short span of time
Present in small numbers
3
The bottom layer of rocks is listed as oldest and the top layer as youngest. What was used?
Law of superposition
Principle of unconformity
Mineral content
Radioactive decay
4
What happens during radioactive decay?
Unstable isotope interacts with another unstable isotope
Stable isotope interacts with unstable isotope
Unstable isotope breaks down and become stable
Stable isotope breaks down and becomes unstable
5
The figure supports uniformitarianism. What geologic change is shown?
Abrasion
Volcanism
Erosion
Deposition
6
A fossil of a palm frond is found in Canada What conclusion can be made?
The climate has not changed
The climate will continue to get colder in future
The climate was warmer than now
The climate was cooler then now
7
Which of these objects would be a fossil that shows camels once lived in FL?
Crystal formation from a cave ceiling
Sedimentary rock that formed long ago
Sinkhole formed by retreating glacier
Remains of an organism preserved by geologic processes
8
How do scientists use fossils to determine the relative ages of rock layers?
Positions of fossils in many layers
Finding other areas of the world same ones found
Comparing all fossils in 1 layer
Comparing all fossils in many different layers
9
Which is NOT an example of a trace fossil?
Footprint in sediment
Burrow in sea floor
Coprolite in sediment
Insect in amber
10
Which is the BEST definition of absolute dating?
Using radioactive isotopes
Measuring the age using any method
Finding age compared to other objects
Determined age of rock by using fossils
11
Which acts as a record of changes in species over time and major changes in Earth's climate?
Composition of ice core samples
Movement of continents
Fossil record
Ripple marks and mud cracks
12
A rock first formed and had 8 milligrams of potassium-40. How much is left after 3 half lives?
4 mg
1 mg
3 mg
2 mg
13
Fossils of plants and animals are found on continents separated by the Atlantic ocean. Why?
The continents used to be 1 land mass
They crossed the atlantic
The organisms today are the same as millions years ago
The atlantic was once freshwater
14
In 1 type of radioactive decay potassium-40 breaks down to Argon-40 which is true about Argon?
Argon is less stable than potassium
Argon is just as stable as potassium
Argon is mor stable than potassium
Argon is the parent isotope
15
How does the fossil record of animals compare to the animals that exist today? Fossil animals..
Are ancestors of animals today
Have no similarities to animals today
are more complex than animals today
Are same as animals today
16
An ingenious intrusion cuts through 3 layers of rock. Which is the youngest?
Bottom layer
Top layer
Igneous intrusion
Middle layer
17
Which is the best proof for scientists to figure out if diff rock layers are same relative age?
Faults
Fossils
Unconformities
Ripple marks
18
What is the main difference between weather and climate?
The length of time both are measured
Only climate includes precipitation
How both are measured
Only weather includes temperature
19
How would Jacob explain his siblings ages using relative dating?
The boys are different ages than the girl
They are all about the same age
Jacob is younger than brother, but older than sister
They are 14,12, and 9
20
What factor/s are responsible for jagged mountains becoming lower and more rounded over time?
Deposition
Movement of continents
Weathering and erosion
Collision between continental plates
