Type
Crossword
Description

Processes occurring today that happened in the past. Principle of Uniformitarianism
Rock is laid down horizontally Law Of Original Horizontally
Each layer above the other is younger than the one under it. Law of superposition
States that any fault or rock is younger than what it cuts across of. Cross Cutting
Any inclusion must be older than the rock it is enclosed in Inclusions
Where old rock and new rock meet Unconformity
Rock type that forms from the cooling of molten rock Igneous Rock
Igneous rock layer form when lava flows onto earths surface Extrusion
Igneous layer formed when magma hardens Intrusion
Refers to layers of sediment. Strata
A break in the earths crust where movement happened Fault
Used to tell the history of the earth Geologic Time Scale
Longest division of geologic time Eon
A subdivision of an eon of the geologic time scale Era
Subdivision of an era Period
Subdivision of geologic time that is longer than an age but shorter than a period Epoch
Smallest subdivision of geologic time Age
Core of ice than can help tell the past Ice Core
Describes species that died off and are no longer living on earth Extinction

Earth History Crossword

Type
Crossword
Description

A disturbance in one or more layers of the Earth's crust Uncomformity
A process that breaks rocks down Weathering
Natural differences VARIATION
A group of an organism tha share most of the same characteristics Species
Weathered rock and other materials deposited by water, wind or ice sediment
A taxonomic group made up of related classes Phylum
Rock that forms under extreme heat, pressure or both Metamorphic Rock
Melted rock Magma
Rock that is formed from magma that has cooled and hardened Igneous rock
The study of Earth's history, processes, and structures Geology
The evidence of an organism that lived in past ages Fossil
No longer found on Earth Extinct
How an organism changes over time Evolution
A division of an eon on the geologic time scale Era
The shortest division of the geologic time scale epoch
The longest unit on the geologic time scale eon

Fossils and Relative Dating Crossword

Type
Crossword
Description

The remnant or trace of an organism from the past Fossils
The study of Earth's formation and structure geology
States that the bottom layer of the sedimentary rock is older than the layer on top Superpositon
is a method of sequencing events in the order they happened Realative Dating
states that a vein of rock that cuts across a rock’s layers is younger than the layers Cross-Cutting relationship
Sometimes rock pieces are found inside another rock. Inclusions
fossils can be used to identify the relative age of the layers of sedimentary rock Faunal Succession
Fossils of widely distributed organisms that lived during only one short period Index Fossil
A place where an old, eroded rock surface is in contact with a newer rock layer. Unconformity
An igneous rock layer formed when magma hardens beneath Earth’s surface. Intrusion
An igneous rock layer formed when lava flows onto Earth’s surface and hardens Extrusion

Geologic Time Scale Crossword

Type
Crossword
Description

The name of an extinction that happened during the Phanerozoic eon Cretaceous
This eon lasted from 542 million years ago to the present Phanerozoic
The eon where the formation of Earth's core happened Hadean
The eon where the first sign of unicellular bacteria took place Achean
During this eon, the "Snow Baller" took place Proterozoic
A major event that occurred during the Proterozoic eon Snow Baller
A length or portion of time Period
A major division of time that is a subdivision of an eon and is itself subdivided into periods Era
A major division of geological time, subdivided into eras Eon
The beginning of a distinctive period in the history of someone or something Epoch
The name of an explosion that happened during the Phanerozoic eon Cambrian
The relatively thin part of the earth's crust that underlies the ocean basins Oceanic Crust
A supposition or a system of ideas intended to explain something Theory
The super continent that Scientist hypothesize that formed during the Proterozoic eon Rodinia
Example: Pangaea, Gondwana, and Laurasia Super Continents

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

Earth History Crossword

Type
Crossword
Description

relating or denoting to the most recent era Cenozoic
Era comprising of the Triassic, Jurassic, and Cretaceous periods Mesozoic
Largest extinction in Earth's history Permian
Prehistoric period during which stone was widely used StoneAge
Period in Earth's history Eon
A major division of geologic time era
The process of change that produces new life forms over time evolution
All the geologic time before the start of the Cambrian Period in the Paleozoic Era. Precambrian
period characterized by the greatest development, rise of modern insects and flowering plants cretaceous
many sea reptiles;early large dinosaurs; later,flying reptiles, and earliest known birds jurassic
Diverse marine life, including vertebrates; vascular plants Ordovician
Numerous fishes, other sea life; many plants, first trees; wingless insects Devonian
Formation of oceans, atmosphere, and continents; bacteria Archaean
Oldest era; organisms developed hard parts Paleozoic
oldest and longest geologic time period precambrian
subdivisions of eras periods
an extinct terrestrial reptile of the Mesozoic era dinosaur
a cold-blooded vertebrate including snakes and lizards reptile
science of the history of the earth as recorded in rocks geology
record of earths history geologic time scale

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 Crossword

Type
Crossword
Description

The Hadean, Archean, and Proterozoic eons together. Makes up 90% of the Earth's history. Precambrian Time
Divides Earth's history into intervals of time defined by major events or changes on Earht. Geological Time Scale
Began 540 million years ago as the supercontinent Pannotia was breaking up. Paleozoic Era
The new supercontinent that was forming during the Paleozoic Era. Pangea
Began 250 million years ago after a mass extinction. Mesozoic Era
Creatures that dominated the world during the Mesozoic Era. DInosaurs
Began about 65 million years ago and continues to the present. Cenozoic Era
The Paleozoic, Mesozoic, and Cenozoic eras combined. Phanerozoic Eon
A major division of geological time, subdivided into eras. Eon
A major division of time that is a subdivision of an eon and is itself subdivided into periods. Era

geologic time Crossword

Type
Crossword
Description

Earth processes occurring today are similar to those that occurred in the past. principal of uniformitarianism
States that sedimentary rock layers are laid down in horizontal layers and so if they are tilted something has disturbed it Law of original horizontality
Geologic principle that states and horizontal layers of sedimentary rock, each layer is older than the layer above it and younger than the layer below it law of superposition
A principle that states that an igneous rock, fart, or other geologic feature must be younger than any rock which it cuts law of cross cutting relationships
A principle that states that an inclusion must be older than the rock it is enclosed in law of inclusions
A place where an old, eroded rock surface is in contact with a new were rock layer unconformity
A type of rock that forms from the cooling of molten rock at or below the surface igneous rock
and igneous rock layer formed when lava flows onto earths surface and hardens extrusion
an igneous rock layer formed when magma hardens beneath earths surface intrusion
term that refers to layers of sedimentary rock strata
a break in earths crust where movement has occurred fault
A system of chronological dating that relates to geological strata to time geologic time scale
The largest division of geologic time eon
A subdivision of an era on the geologic time scale period
Is subdivision of an eon on the geologic time scale era
A subdivision of geologic time that is longer than an age but shorter than a period epoch
The smallest subdivision of geologic time age
a drill core of ice that can help tell the climates of the past ice core
A term that typically describes a species that no longer has any known living individuals extinction

Plate Tectonics Crossword Puzzle

Type
Crossword
Description

What describes large scale movements of the Earth's lithosphere? Plate Tectonics
The lithosphere is divided into... Tectonic Plates
Two plates collide they make... Convergent Boundaries
When two plates move away from each other this is called... Divergent Boundaries
A boundary at which two plates move past each other horizontally is called a... Transform Boundary
What is the outermost rigid layer of Earth? Lithosphere
What is a layer of weak or soft mantle that is made of rock? Asthenosphere
What is the strong lower part of the Earth's mantle? Mesosphere
What explains the age and magnetic patterns of sea floor rocks? Sea-Floor Spreading
What is the outermost layer of Earth? Core
What is the movement of matter that results from differences in density? Convection
What is located between the core and the crust? Mantle
What extends from below the mantle to the center of Earth? Core
What element makes up most of Earth's core? Iron
What is the liquid layer of Earth's core? Outer core
What is dense and is in the center of Earth and extends from the bottom of the outer core to the center of Earth? Inner core
What are the huge trenches on Earth's seafloor? Ocean Trenches
What pushes the rest of a plate away from the mid-ocean ridge? Ridge Push
What is the portion of motion of a tectonic plate that can be accounted for b the portion of motion of a tectonic plate that can be accounted for by its subduction? Slab Pull
What is the slow creeping motion of Earth's solid silicate mantle caused by convection currents carrying heat from the interior of the Earth to the surface? Mantle Convection

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