Show:
Rocks
Fossils
Landforms
Time Scale
Earth's History
100
Formed when molten rock cools and hardens.
What is igneous?
100
A remnant or trace left behind by an animal or plant embedded in an existing rock.
What is a Fossil?
100
A nearly level area that has been uplifted
What is a Plateau?
100
An event that happened within an era.
What is a period of time?
100
4.5 bya this planet was formed.
What is the Earth?
200
Another word for settled.
What is sedimentary?
200
An organism that existed for a short period of time, but all over the word.
What is an Index Fossil?
200
A lower area between mountains and hill usually where water flows
What is a Valley?
200
Major spans of time based on life-forms that have been found in rocks of that age.
What is an Era?
200
This liquid appeared on Earth's surface and allowed life forms to appear.
What is water?
300
The rocks that change because of heat and/or pressure.
What is igneous, metamorphic, and sedimentary?
300
Fossils are found in many different layers but these fossils are more commonly found in one.
What is an Index Fossil?
300
A curve or a turn in a river.
What is a Meander?
300
The front of a geological timeline represents this.
What is the present?
300
This bacteria formed soon after water appeared.
What is Protozoa?
400
Rocks that are not likely to contain fossils.
What is metamorphic and/or igneous?
400
Marine organisms, that were abundant during the early Paleozoic era, but were extinct during the Mesozoic era.
What is a trilobite?
400
A canyon that is well known in Arizona, and the Colorado river cuts through, and where many fossils are located in its many layers.
What is the Grand Canyon?
400
These two periods of time are found in the Cenozoic Era.
What is Quaternary and Tertiary?
400
This type of fish is boneless and appeared after the Protozoa.
What is Jellyfish?
500
The series of processes that cause rocks to change from one type to another.
What is the rock cycle?
500
This trilobite appeared in the early ages of the Cambrian time period.
What is an Olenellus?
500
When a flood occurs the land around it is covered in water.
What is a Floodplain?
500
These 3 periods of time are found in the Mesozoic time era.
What is Cretaceous, Jurassic, and Triassic?
500
Many life forms died over this period of time.
What is the Great Extinction?