If you see layers in a rock formation, but are told that the lowest layers are not the oldest

The layersof rock had shifted from their original position.

Bertha found a shark fossil. What is the best way to determine its age?

determine the age of the layer of sediment around the fossil

Scientists find a fossil of a fish on top of a mountain. Explain what evidence it provides.

It shows that the mountainmay have once been under water

preserved remains or traces of organisms that livedin past

If you notice that rock formation have horizontal layers, what can you infer?

The lower layers are older than the upper layers.

Geologists use radioactive dating to

determine the absolute ages of rocks.

The rock in the Grand Canyon are between 2 billion and 230 million years old. How do we know?

the amounts of radioactive elements in each rock

What has the study of fossils allowed scientists to do?

describe past environments and the history of life

The relative age of a rock is

its age compared with the ages of other rocks.

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6th Unit 2 Geologic Time

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Geologic time review

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Questions 19

Answers

1
If you see layers in a rock formation, but are told that the lowest layers are not the oldest
The rock was located in adesert climate.
The layers of rocks had been to weathered and eroded
The rock was formed on an ancientocean floor.
The layersof rock had shifted from their original position.
2
Bertha found a shark fossil. What is the best way to determine its age?
determine the age of the layer of sediment around the fossil
look at it through a microscope
compare to modern shark's teeth
thest the hardness of the fossil
3
Scientists find a fossil of a fish on top of a mountain. Explain what evidence it provides.
It shows that the mountainmay have once been under water
It shows that animals found in the mountainevolve from fish
a. shows that fish were once able tolive without water
a. It shows that ocean can change quicklyand become land
4
What are fossils?
footprints or burrows of small animals that live today
molds and casts of organisms that live today
preserved remains or traces of organisms that livedin past
drawings of ancient animals and other organisms
5
If you notice that rock formation have horizontal layers, what can you infer?
The layers combined to form a new type of rock.
The lower layers are older than the upper layers.
The layers were laid down at the same time.
The upper layers are older than the lower layers.
6
This is an example of ___________________.
preserved remains
mold
cast
petrified fossil
7
This is an example of a ________.
petrified fossil
cast
mold
trace fossil
8
The fossil record shows that life on Earth has changed overtime. Older organisms are
only organisms that are alive today
organisms that are more complex than those alive today.
simpler organisms
both simple and complex organisms.
9
This is an example of __________________.
mold
carbon film
cast
preserved remains
10
Geologists use radioactive dating to
determine the relative ages of rock layers.
tell the difference between molds and casts.
tell where one soil horizon ends and the next one begins.
determine the absolute ages of rocks.
11
A type of organism that no longer exists on Earth is said to be
extint
fossilized
petrified
sedimentary
12
This is an example of _________________.
cast
carbon film
mol
petrified fossil
13
What evidence do scientistshave to support the theory: all landmasses were together in Pangaea?
water samples from every ocean
temperature changes on Earth over the last several decades
the diversity of modern organism
the fossil record
14
The time it takes for half of the radioactive atoms in a sample of an element to decay is
half-life
absolute age
relative age
potassium-argon date
15
The rock in the Grand Canyon are between 2 billion and 230 million years old. How do we know?
the size and hardness of each rock
the amounts of radioactive elements in each rock
the size of the crystals that make up each rock
the location of each rock
16
What has the study of fossils allowed scientists to do?
predict which organisms will become extinct in the future
analyze chemical composition of sedimentary rocks
study present ocean temperatures at different depths
describe past environments and the history of life
17
This is an example of a ________________.
trace fossil
mold
carbon film
cast
18
The relative age of a rock is
its age compared with the ages of other rocks.
its age based on how much carbon-14 the rock contains.
less than the age of the fossils the rock contains.
the number of years since the rock formed.
19
Principle states geologic processes that change Earth today also changed Earth in the past?
evolution
erosion
uniformitarianism
superposition

6th Unit 2 Geologic Time Flashcards | StudBud