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