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- 1. Multiple Choice
Age of a rock compared to the ages of other rocks, such as "this rock is older than the rest in the area".
Absolute Age
Law of Superposition
Relative Age
Unconformity
- 2. Multiple Choice
the number of years that have passed since the rock was formed, such as, "this basalt layer is 1000 years old +/- 20 years".
absolute age
law of superposition
relative age
unconformity
- 3. Multiple Choice
In undisturbed horizontal layers of sedimentary rock, the oldest rocks are found at the bottom. Each higher layer is younger than the layer(s) below it.
absolute age
law of superposition
relative age
unconformity
- 4. Multiple Choice
A gap in the geologic record due to erosion. Where new rock layers meet a much older rock surface beneath them.
absolute age
law of superposition
relative age
unconformity
- 5. Multiple Choice
Lava that hardens on the Earth's surface, forming igneous rock is an example of:
extrusion
fault
index fossil
intrusion
- 6. Multiple Choice
Magma pushes into rock layers below the surface of the earth where it cools and hardens into igneous rock.
extrusion
fault
index fossil
intrusion
- 7. Multiple Choice
Always younger than the rock layers that it cuts through, this break in Earth's crust is caused by forces acting on the rocks on either side.
extrusion
fault
index fossil
intrusion
- 8. Multiple Choice
Widely distributed and representing an organism that existed for a geologically short period of time, they are useful in finding relative age of rocks they are found in.
extrusion
fault
index fossil
intrusion
- 9. Multiple Choice
The breakdown of radioactive elements over time, where the atoms of one element break down to form atoms of another element.
half-life
law of superposition
radioactive decay
relative age
- 10. Multiple Choice
The time it takes for half of the radioactive atoms to decay. This rate never changes.
half-life
law of superposition
radioactive decay
relative age
- 11. Multiple Choice
A record of the geological events and the evolution of life on Earth, as seen by fossil record is:
era
geologic time scale
period
time line
- 12. Multiple Choice
The Geologic Time Scale is divided into large amounts of time which are identified by changes in life and condition of earth, named: Paleozoic, Mesozoic, and Cenozoic. These are called:
eras
periods
time scales
history
- 13. Multiple Choice
Geologic time begins with:
Cenozoic Era
Mesozoic Era
Paleozoic Era
Precambrian Time
- 14. Multiple Choice
What do scientists believe pulled the dust, rock, and ice in space together to form our planet?
energy from the sun
gravity
magnetic force
velocity
- 15. Multiple Choice
Why do geologists use the geologic time scale to show Earth's history?
because the size of Earth is so great
because the time span of Earth's past is so great
because the size of Earth is so small
because the time span of Earth's past is so small
- 16. Multiple Choice
Index fossils are useful when identifying the relative age of rock because they are:
widespread & have a relatively short lifespan
widespread and they have a relatively long lifespan
occur in a small area and have a relatively short lifespan
occur in a small area and have a relatively long lifespan
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