what has the study of fossils allowed scientists to do

describe past environment and the history of life

the relative age of a rock is

its age compared with the ages of other rocks

Geologists use radioactive dating to

determines the absolute ages of rocks

which led scientists to infer that Earth is about 4.6 billion years old

using radioactive dating on moon rocks

preserved remains of organisms that lived in the past

radioactive decay occurs when atoms of some elements

break down to form atoms of another element

studbud

Ch. 4 review

18 termsStudBud Administration126 plays

A #science review for your Test Thursday

Flashcards18 cardsFPractice quizPHost liveL

Questions 18

Answers

1
plant leaves are examples of
trace
mold
carbon film
preserved
2
principle that changed Earth today and Earth in the past
superposition
uniformitarianism
evolution
erosion
3
long span of time that covers about 88% of Earths history and ended 542m years ago is called
Paleozoic era
Precambrian time
Cenozoic era
Mesozoic era
4
what has the study of fossils allowed scientists to do
predict which organisms will become extinct in the future
study present ocean temp. at different depths
analyze the chemical composition of sedimentary rocks
describe past environment and the history of life
5
paleontologists are scientists who study
trees
water
fossils
soil
6
footprints and trails are examples of
trace
cast
petrified
carbon film
7
the relative age of a rock is
less than the age of the fossil the rock contains
its age based on how much carbon-14 the rock contains
its age compared with the ages of other rocks
the numbers of years the rock formed
8
time it takes for half of the radioactive atoms ina sample of a radioactive element to decay
half-life
relative age
potassium-argon age
absolute age
9
fossils usually occur in what type of rock
metamorphic
shells
sedimentary
igneous
10
a fossil formed when minerals replace all or part of an organism is called a
mold
petrified fossil
cast
trace fossil
11
Geologists use radioactive dating to
determine the relative ages of rock layers
tell where one soil horizon ends and the next one begins
tell the difference between molds and casts
determines the absolute ages of rocks
12
which led scientists to infer that Earth is about 4.6 billion years old
studing the fault lines
studying index fossils
applying the law of superposition
using radioactive dating on moon rocks
13
what are fossils
footprints or burrows of small animals that lived today
preserved remains of organisms that lived in the past
molds and casts of organisms that live today
drawing of ancient animals and other organisms
14
Geologists divide Earths long history into smaller units that make up
trace
fossil record
trees
geologic time scale
15
a type of organism that no longer exists on Earth is said to be
sedimentary
fossilized
extinct
petrified
16
what is the age of an intrusion of igneous rock in relation to the sedimentary rock layers
always younger
sometimes younger, sometimes older
the same age as the other rock
always older
17
radioactive decay occurs when atoms of some elements
break down to form atoms of another element
join with atoms of another element
are exposed to chemical weathering
become part of a fossil
18
sometimes forces inside Earth turn rock layers over completely. this is called
a fault
folding
an unconformity
an intrustion

Ch. 4 review Flashcards | StudBud