Fossils and Geologic Time Scale

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What is the law of superposition?

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The law of superposition states that in undisturbed sedimentary rock layers, the oldest layers are at the bottom and the youngest layers are at the top.

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NGSS.MS-ESS1-4

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Which layer is the youngest according to the law of superposition?

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The youngest layer is the one at the top.

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NGSS.MS-ESS1-4

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What is a fossil?

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A fossil is the preserved remains or traces of ancient living organisms.

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NGSS.MS-LS4-1

NGSS.MS-LS4-2

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Do all living organisms leave behind fossils?

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No, not all living organisms leave behind fossils.

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NGSS.MS-LS4-1

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What does it mean when we say some living things have not really changed in millions of years?

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It means that certain species have remained relatively unchanged in their physical form over long periods of geological time.

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NGSS.MS-LS4-1

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What era did dinosaurs rule the Earth?

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Dinosaurs ruled the Earth during the Mesozoic era.

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What is the Principle of Uniformitarianism?

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The Principle of Uniformitarianism states that the geologic processes that operate today also operated in the past.

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NGSS.MS-LS4-1

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Why are there more animal fossils than plant fossils?

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There are more animal fossils because animals generally have harder parts that are more likely to be preserved compared to the softer bodies of plants.

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What is the Cenozoic era known for?

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The Cenozoic era is known as the age of mammals.

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What is the Paleozoic era known for?

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The Paleozoic era is known for the development of early life forms, including fish, amphibians, and reptiles.

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2