The geologic time scale is a record of...

the life forms and geologic events in Earth's history

Why are index fossils useful to geologists?

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

the preserved remains or traces of an organism

How do most fossils form?

Living things die and their remains are buried by sediments

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

older than the layer above it and younger than below it

Why do geologist use the geologic time scale to measure geologic time, instead of years?

the time span of Earth's history is so great

What is the relative age of a rock?

its age compared to the ages of other rocks

Precambrian Time, which includes most of Earth's history, begin with

Earth forming from a mass of dust and gas

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Milestones practice 7, A trip through geologic time

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1
The geologic time scale is a record of...
the life forms and geologic events in Earth's history
the time since the evolution of dinosaurs
the thickness of sedimentary rock layers
the rate of fossil formation
2
Fossils show that live on Earth have changed over time. Older rocks contain fossils of...
more complex organisms
both simple and complex organisms
simpler organisms
only organisms that are alive today
3
The fossils of organisms that were widely distribute but only lived short period of time are
petrified fossils
trace fossils
index fossils
carbon film fossils
4
About 250 million years ago, Earth's continents moved together to form a supercontinent called
Cambria
North America
Pangaea
Antarctica
5
Why are index fossils useful to geologists?
they tell the absolute age of the rock in which they occur
they tell the ages of many different rock layers
they tell the age of the rock at one location only
they tell the relative age of the rock in which they occur
6
What is a fossil?
any dead organism
the preserved remains or traces of an organism
an unusual type of rock
a perfect copy of a rock
7
How do most fossils form?
The soft parts of an organism change to stone
The hard parts of an organism dry out in the air
Freezing preserves the remains of an organism
Living things die and their remains are buried by sediments
8
The law of superposition states that, in horizontal layers of sedimentary rock, each layer is..
younger than the layer above it and older than below it
always older than any vertical layers
older than the layer above it and younger than below it
neither older nor younger than the other layers
9
Time it takes for half of the radioactive atoms in sample of a radioactive element to decay is
relative age
half-life
absolute age
potassium-argon date
10
Why do geologist use the geologic time scale to measure geologic time, instead of years?
they are still looking or a way to measure time
they have no absolute ages for any rocks or fossils
they are still looking for index fossils for every centry
the time span of Earth's history is so great
11
The Cenozoic era is often called the Age of...
Fishes
Amphibians
Mammals
Reptiles
12
What is the age of intrusion of igneous rock in relation to sedimentary rock layer it cuts
sometimes younger, sometimes older
the same age as the other rock layers
always older
always younger
13
The Paleozoic, Mesozoic, and Cenozoic are divisions in the geologic time scale called
periods
layers
epochs
eras
14
Which type of fossil can provide clues about the activities of ancient organisms?
trace fossils
mold
fossils in amber
replacement fossils
15
What is the relative age of a rock?
its age based on how much carbon-14 the rock contains
its age compared to the ages of other rocks
the number of years since the rock formed
less than the age of the fossils the rock contains
16
Precambrian Time, which includes most of Earth's history, begin with
an asteroid impact
the formation of thick deposits of sediment
an ice age
Earth forming from a mass of dust and gas
17
A type of organism that no longer exists on Earth is said to be
fossilized
pertified
extinct
evolved

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