The geologic time scare is a record of

the life forms and geological events in Earth's history

Because life has changed over time, we have found that older rocks contain fossils of

organisms that are simpler than those alive today.

How do most fossils form?

Living things die and their remains are buried by sediments

Why are index fossils useful to geologist?

they tell the relative age of the rock in which they occur

The law of superposition states that in horizontal layers of sedimentary rock, each layer is

older than the layer above it, younger than the layer below

the preserved remains or traces of an organism

Radioactive decay occurs when atoms of an unstable element

break down to form atoms of another element

The relative age of rock is

its age compared to the ages of other rocks

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Earth's History

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Quiz to help understand Earth's History #earth'shistory

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Questions 15

Answers

1
The geologic time scare is a record of
the time since evolution of dinosaurs
the thickness of sedimentary rock layers.
the life forms and geological events in Earth's history
the rate of fossil formation
2
Because life has changed over time, we have found that older rocks contain fossils of
organisms that are more complex than those alive today.
both simple and complex organisms.
only organisms that are alive today.
organisms that are simpler than those alive today.
3
Which type of fossil can provide clues about the activities of ancient organisms?
carbon films
remains preserved in amber
trace fossil
molds and casts
4
Time it takes for half of the radioactive atoms in a sample to decay is the elements
absolute age
relative age
half-life
potassium-argon date
5
Radioactive dating works best with what type of rocks?
sedimentary rock
metamorphic rock
igneous rock
fossilized rock
6
How do most fossils form?
Freezing preserves the remains of an organism
Living things die and their remains are buried by sediments
the soft parts of an organism change to stone
the hard parts of an organism dry out in the air
7
The process by which living things have changed over long periods of time
replacement
deposition
sedimentation
evolution
8
Why are index fossils useful to geologist?
they tell the ages of many different rock layers
they tell the absolute age of the rock in which they occur
they tell the ge of rock at one location only
they tell the relative age of the rock in which they occur
9
The law of superposition states that in horizontal layers of sedimentary rock, each layer is
always older than any vertical layers
older than the layer above it, younger than the layer below
younger than the layer above it, older than the layer below
neither older nor younger than the other layers
10
What is a fossil?
an unusual type of rock
the preserved remains or traces of an organism
any dead organism
a perfect copy of a rock
11
Radioactive decay occurs when atoms of an unstable element
break down to form atoms of another element
join with atoms of another element
become part of a fossil
are exposed to chemical weathering
12
Radioactive dating allows geologist to determine
the age of the atoms in a rock
the absolute ages of rocks
the relative ages of rocks
the half-life of a fossil organism
13
The relative age of rock is
its age compared to the ages of other rocks
the number of years since the rock formed
its age based on how much carbon-14 the rock contains
less than the age of the fossils the rock contains
14
Fossils of organisms that were widely distributed but only lived during a short period of time
petrified fossils
trace fossils
index fossils
carbon film fossils
15
A fossil formed when minerals replace all or part of an organisms is called a
petrified fossil
mold
cast
trace fossil

Earth's History Flashcards | StudBud