Type
Word Search
Description

absolute dating
cast
decay element
extinct
extrusion
fossil record
geologic column
geologic time
half-life
ice core
index fossil
isotope
mold
petrified
radioactivity
radiometric dating
strata
trance fossil
unconformity
uniformitarianism

Geologic Time and Rock Layer Crossword

Type
Crossword
Description

A body between to igneous rocks without reaching the surface. Intrusions
To elevate a piece of land. Uplift
The relative order of past events. Relative Dating
To move in a sloping position. Tilting
A theory that describes a challenging concept about the nature and behavior Superposition
A fossil that is useful for dating Index Fossil
Rocks that formed from lava on the surface of the earth. Extrusions
A method of dating geological rocks or fossils. Radiometric Dating.
A surface of contact between two groups of unconformable strata. Unconformity
when one or a stack of originally flat and planar surfaces, such as sedimentary strata, are bent or curved Folding
the process of determining an age on a specified time scale in archaeology and geology. Absolute Dating
The theory that changes in the earth's crust during geological history have resulted from the action of continuous and uniform processes. Uniformitarianism
A rock layer that is split due to this. Faulting
The remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock. Fossil
A rock that has formed from sediment deposited by water or air. Sedimentary
The process by which soil and rock particles are worn away. Erosion

Earth History #1 Crossword

Type
Crossword
Description

earliest era of earth history, ending 570 million years ago Precambrian
a core sample that is typically removed from an ice sheet ice core
between the end of the Precambrian eon and the beginning of the Ordovician period. Cambrian
the state or process of a species, family, or larger group being or becoming extinct. "the extinction of the great auk" extinction
a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers Law of superposition
a system of chronological dating that relates geological strata to time Geological time scale
any method of determining the age of earth materials or objects of organic origin based on measurement of short-lived radioactive elements radioactive dating
a fossil that is useful for dating and correlating the strata in which it is found Index fossil
process of determining an age on a specified chronology in archaeology and geology Absolute dating
the remains or impression of a prehistoric organism preserved in petrified form fossil
the science of determining the relative order of past events relative dating
the outermost layer of a planet crust

Geologic Time and Earth's History Crossword

Type
Crossword
Description

A time when many species such as humans came to be. CenozoicEra
A global extinction that causes at least 80% of a species to die. K-T Extinction
A tool used to relate geological events to time. Geologists often use this. Geologic Time Scale
The earliest period of Earth's history. Precambrian Time
The largest section of geological time. Eon
The era when dinosaurs were alive. Mesozoic Era
A span of time defined by large events. Era
One of the subdivisions on the geological time scale. Also a punctuation mark. Period
The second smallest division in geologic time. Epoch
The extinction of dinosaurs happened within this era. Paleozoic Era
Measurement of age in exact years. Absolute age
The isotope that undergoes radioactive decay in a nuclear reaction. Parent Isotope
Unchanged fossil remains from extinct or dead animals. Original Remains
A buried surface seperating two rock masses of different ages. Uncomformity
The product atom formed during radioactive decay in a nuclear reaction. Daughter Atom
A technique used to date materials such as rocks or carbon. Radioactive dating
States that the oldest rocks will be at the bottom and will have formed first. Law of Superposition
Rings on a tree trunk representing a single year's growth with each line. tree rings
The remains or impression of a prehistoric organism. Fossil
The age of something in relation to something else. Relative Age
A fossil that is used for dating and correlating the strata in which it is found. Index fossil
A fossil of a footprint rather than the animal itself. trace fossil
A core sample typically removed from an ice sheet. Ice Cores
A fossil found in rock that was created long after the animal of it died. Rock Fossil
the time taken for a radioactive isotope to fall to half of its original value. Half-life

Geologic Time Word Search

Type
Word Search
Description

absolute-age dating
correlation
cross-cutting relationship
dendrochronology
eon
epoch
era
fossil
geologic time scale
granite
groundwater
half-life
isotope
key bed
mass extinction
original horizontality
period
Precambrian
principle of inclusions
radioactive decay
radiocarbon dating
radiometric dating
relative-age dating
superposition
unconformity
uniformitarianism
varve

Absolute Dating Word Search

Type
Word Search
Description

ABSOLUTE DATING
AGE
DAUGHTER ISOTOPE
FOSSILS
HALF-LIFE
INDEX FOSSILS
METEORITE
ORGANISMS
PARENT ISOTOPE
POTASSIUM DATING
RADIOACTIVE DECAY
RADIOACTIVE ISOTOPES
RADIOCARBON DATING
RADIOMETRIC DATING
TROPITES FOSSILS
URANIUM-LEAD DATING

CLUES TO EARTHS PAST Crossword

Type
Crossword
Description

Remains, imprints, or traces of prehistoric organisms. Fossil
Remains of species that existed on Earth for a short period of time. Index Fossil
The time taken for any specified property to decrease by half. Half-Life
Living thing such as animal, plant and human. Organism
Somethings age, to the comparison to the ages of other things. Relative Age
A thin film of carbon residue is left, forming a silhouette of the original organism Carbon Films
A hard part of something being dissolved and leaving behind a cavity. Mold
Gaps in rock sequences are called _____________. Unconformities
The solid, nonmetallic mineral matter of which rocks are made of. Stone
The age, in years, of a rock or other object. Absolute Age
A method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample. Radiometric Dating
A fossil of a footprint, trail or burrow. Trace Fossil
Belonging to or forming the outer surface or structure of something. External
Sometimes conditions allow ________ _________ of organisms to be preserved for millions of years. Original Remains
A scientist who studies fossils. Paleontologist
Plant matter accumulating, over millions of years, these deposits become completely carbonized, forming ____. Coal
The process in which something is being broken down. Radioactive Decay
A person, animal, or group living in a place or environment. Inhabited
Rock formed when sediments are cemented and compacted. Sedimentary Rock
An expert in or student of geology. Geologist

7 chapter 5 vocabulary Word Search

Type
Word Search
Description

uniformitariansm
radiometric dating
half-life
radioactive decay
absolute age
unconformities
relative age
principle of superposition
index fossils
mold
cast
carbon film
Permineralized remains
Fossils

Clues to Earth's Past Crossword

Type
Crossword
Description

Remains, imprints, or traces if prehistoric organisms that can tell when and where organisms once lived and how they lived. Fossils
Fossils in which the spaces inside are filled with minerals from groundwater. Permineralized remains
Thin film of carbon residue preserved as a fossil. Carbon film
A type of body fossil that forms in rock when an organism with hard parts is buried. Mold
A type of body fossil that forms when crystals fill a mold or sediments wash into a mold and harden into a rock. Cast
Remains of species that existed on Earth. Index fossil
States that in undisturbed rock layers. Principle of Superposition
The age of something compared with other things. Relative age
Gap in the rock layer that is due to erosion or periods without any deposition. Unconformity
Age, in years, of a rock or other object; can be determined by using properties of the atoms that make up materials. Absolute age
Release of nuclear particles and energy from unstable atomic nuclei. Radioactive decay
Time needed for one half of the mass of a sample of a radioactive isotope to decay. Half-life
Process used to calculate the absolute age of rock by measuring the ratio of parent isotope to daughter product in a mineral and knowing the half-life of the parent. Radiometric dating
Principle stating that Earth processes occurring today are similar to those that occurred in the past. Uniformitarianism

Geologic Time/Fossils Word Search

Type
Word Search
Description

Evolution
Index Fossil
Unconformity
Law of Superposition
Trace Fossil
Cast
Molds
Petrification
Fossil
Absolute Age
Relative Age
Cenozoic
Mesozoic
Paleozoic
Precambrian
Geologic Time

Geologic History Crossword

Type
Crossword
Description

the preserved remains or traces of living things - a fossil type Fossil
a hollow area in sediment in the shape of an organism or part of an organism - a fossil type Mold
a hollow area in sediment in the shape of an organism or part of an organism - a fossil type Cast
fossils in which minerals replace all of an organism or part of an organism such as a dinosaur bone - a fossil type Petrified Fossil
an extremely thin coating of carbon on rock - a fossil type Carbon Film
provides evidence of the activities of ancient organisms - a fossil type Trace Fossil
a process that preserves entire organisms, i.e. tar, tree resin, freezing - a fossil type Preserved Remains
scientists that study fossils Paleontologist
the number of years that have passed since a rock formed Absolute Age
the age of a rock compared to other rocks, i.e. older or younger than Relative Age
when an organism no longer exists and will never again on earth Extinct
to determine the relative age of a rock. It states that in undisturbed horizontal sedimentary rock layers the oldest is at the bottom Each higher layer is younger than the one below it Law of Superposition
a fossil that is widely distributed and and in existence for a relatively short period in geologic history. They are useful because they tell tell the relative age of the rock in which they are found Index Fossil
a gap in the geological record that shows where rocks are lost due to erosion/ folding, etc... Unconformity
it is the time it takes for a radioactive element for half of the elements to decay Half-Life
elements that release particles of energy and they beak down or decay over time. Atoms of one element break down to form atoms of another element Radioactive Decay
the time period between the Pre -Cambrian and present time period; Paleozoic, Mesozoic and Cenozoic Eras
Eras that are subdivided. Many of the names come from places where fossils were discovered Periods
the key principle that guides scientists when they make inferences about Earth's past and is states that the geologic processed that operate today also operated in the past Uniformitarianism