Chapter 5

Front 1

If the same type of fossils are found in two separate rock layers, it's likely that the two rock layers

Back 1

are part of one continuous deposit

Front 2

Gaps in rock layers are called

Back 2

uncomformities

Front 3

Determining the order of events and the relative age of rocks by examining the position of rocks in a sequence is called ...

Back 3

relative dating

Front 4

Dinosaur footprints are

Back 4

trace fossils

Front 5

If the same sequence of rock layers is observed over a large area,

Back 5

a large deposit of rock formed over a large area

Front 6

Carbon films are formed when a thin layer of _________ is left, forming a silhouette of the original organism.

Back 6

carbon

Front 7

A ______ may tell a geologist when, where, and how an organism lived.

Back 7

fossil

Front 8

A _______ is the cavity left behind in the rock after an organism's hard part has dissolved.

Back 8

mold

Front 9

Fossils up to 75,000 years old can be dated with __________.

Back 9

carbon 14

Front 10

The _______ parts of organisms are likely to become fossils.

Back 10

hard

Front 11

The _______ parts of organisms are likely to become fossils.

Back 11

hard

Front 12

The _______ parts of organisms are likely to become fossils.

Back 12

hard

Front 13

_____ is measured in half-lives.

Back 13

radioactive decay

Front 14

Preserved animal tracks are called ______ fossils

Back 14

trace

Front 15

Fossils are the _______, imprints, or traces of once-living organism preserved in rock.

Back 15

remains

Front 16

An unconformity is a _______ of rock.

Back 16

missing layer

Front 17

Where can original remains be preserved?

Back 17

ice, tar, amber

Front 18

Rock layers are correlated if they both contain the same _______.

Back 18

fossils

Front 19

_______ dating uses the properties of atoms in rocks and other objects to find their ages.

Back 19

absolute

Front 20

made when sediments fill in a cavity made when an object decayed and the sediments harden into rock

Back 20

cast

Front 21

fossils of species that lived on Earth for short periods of time and were abundant and widespread

Back 21

index fossils

Front 22

states that for undisturbed rocks, the oldest rocks are on the bottom and the rocks become younger and younger toward the top

Back 22

principle of superposition

Front 23

hollow place in rock made when an organism died and was buried and holes in the rock let air or water reach it and dissolve the organism

Back 23

mold

Front 24

a process that uses the properties of atoms in rocks and other objects to find their ages

Back 24

radioactive decay

Front 25

fossil formed when an outline of the original organism is formed from left over carbon

Back 25

carbonaceous film

Front 26

states that Earth processes today are similar to those that took place in the past

Back 26

uniformitarianism

Front 27

gaps in rock layers that develop when agents of erosion remove existing rock layers

Back 27

unconformities

Front 28

the process in which one of the isotope's neutrons breaks down into a proton and an electron and the electron leaves the atom as a beta particle

Back 28

beta decay

Front 29

the time it takes for half of the atoms in an isotope to decay

Back 29

half-life