Earth's History

Fossil

• the fossilized carbon outline of an organism or part of an organism
• The age of a rock compared to the ages of rock layers
• A preserved remnant or impression of an organism that lived in the past.

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Mold

• A fossil formed when an organism buried in sediment dissolves, leaving a hollow area.
• Smallest particle of an element and the basic unit of matter
• The age of a rock compared to the ages of rock layers

Tags

NGSS.MS-LS4-1

Cast

• Change in a kind of organism over time; process by which modern organisms have descended from ancient organisms.
• A type of fossil that forms when a mold becomes filled in with minerals that then harden
• length of time required for half of the radioactive atoms in a sample to decay

Tags

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petrified fossil

• length of time required for half of the radioactive atoms in a sample to decay
• A fossil formed when minerals replace all or part of an organism
• era that began about 66 million years ago, known as the "Age of Mammals"

Tags

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carbon film

• A fossil formed when an organism buried in sediment dissolves, leaving a hollow area.
• the fossilized carbon outline of an organism or part of an organism
• length of time required for half of the radioactive atoms in a sample to decay

Tags

NGSS.MS-LS4-1

trace fossil

• marked by significant worldwide changes in the types of fossils present in rock
• a fossil of a footprint, trail, burrow, or other trace of an animal rather than of the animal itself.
• the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element

Tags

NGSS.MS-LS4-1

Paleontologist

• Smallest particle of an element and the basic unit of matter
• the fossilized carbon outline of an organism or part of an organism
• A scientist who studies fossils to learn about organisms that lived long ago

Tags

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Evolution

• A preserved remnant or impression of an organism that lived in the past.
• Change in a kind of organism over time; process by which modern organisms have descended from ancient organisms.
• length of time required for half of the radioactive atoms in a sample to decay

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extinct

• Groups of fossils used to identify geologic periods
• no longer in existence
• A fossil formed when minerals replace all or part of an organism

Tags

NGSS.MS-LS4-1

Law of Superposition

• A preserved remnant or impression of an organism that lived in the past.
• A fossil formed when an organism buried in sediment dissolves, leaving a hollow area.
• The top rock layer and its fossils is the youngest and the bottom is the oldest.

Tags

NGSS.MS-ESS1-4