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Fossils unit test
Question | Answer |
---|---|
The preserved remains or traces of living things are called ______ | fossils |
Fossils that are made out of minerals that have turned to stone are called ______ | petrified fossils |
A copy of the shape of an organism is what type of fossil? | cast fossil |
_____ is the hard resin, or sap, of evergreen trees | amber |
three ways entire organisms can be preserved are ______ | amber, tar, or ice |
A hollow area of sediment in the shape of an organism is called a _____ | mold |
the evolutionary process of an organism changing to become better suited to survive in it's environment is called ____ | adaption |
_______ provide evidence of the activity of ancient organisms. | trace fossils |
organisms that no longer exist on the planet are said to be _____ | extinct |
this law states that the oldest rock layer is found at the bottom and the youngest at the top. | Law of Superposition |
The rock layer of 250 million years old. This describes the _______ of the rock | absolute age |
The Law of Original Horizontality states that all rock layers are laid down _____ | flat |
The statement that the rock layer is younger than the 100 million year old extrusion but older than the 50 million year old intrusion is an example of ______ | relative age |
Rock layers with a wavy line at the top represent ______ | erosion |
Intrusions are always _____ than the rock layers they are found in. | younger |
a _____ is a break or crack in the earth's crust along which rocks move. | fault |
fossils of widely distributed organisms that lived for only a short period of time are called ______ | index fossils |
the gradual change in living things over long periods of time is called ______ | evolution |
The history of life on earth on a calendar is called the ______ | geologic time scale |
In what time in Earth's history was the earth's atmosphere formed? | Precambrian |
List possible causes of mass extinctions in Earth's past or possibly the future. | asteroids, volcanoes, human impact |
Magma found within a rock layer is called an ________ | intrusion |
The youngest layer of the rock will always be at the ____ | top |
we live in what era of earth's history? | Cenozoic |
magma that flows onto the surface of a rock layer is called an _______ | extrusion |
What are 3 things humans are doing today that can result in the extinction of a species? | overpopulation, pollution, deforestation |
Whatever the actual cause of a mass extinction, it usually results in the Earth's _______ changing, killing off the organisms that live there. | climate |
This occurs in rick layers when unequal forces within the earth pushes up in one area. | tilting |
Earth's time scale dates back as far as _______ years ago. | 4.6 billion |
Where are MOST fossils preserved? | sedimentary rock |
The most important step that has to occur for an organism to become a fossil is ___ | to be buried in sediment |
Which parts of an organism are most likely to be preserved as a fossil? | |
What important event happened 2.5 billion years ago when some organisms began using photosynthesis to make their food? | Formed the earth's atmosphere |