STMS 2ndQ Practice Test

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What is a trilobite?

Back

A trilobite is an extinct marine organism that lived during the Paleozoic era, known for its hard exoskeleton and segmented body.

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What does the Law of Superposition state?

Back

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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What is the significance of fossil layers in geology?

Back

Fossil layers help scientists understand the chronological order of life on Earth and the environmental conditions of different geological periods.

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What are soft-bodied organisms?

Back

Soft-bodied organisms are those that do not have hard parts like shells or bones, making them less likely to be preserved as fossils.

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What is the Precambrian eon?

Back

The Precambrian eon is the earliest part of Earth's history, spanning from the formation of the Earth (about 4.6 billion years ago) to 541 million years ago, and includes the appearance of the first simple life forms.

Front

What can fossils tell us about past environments?

Back

Fossils can provide evidence of the types of organisms that lived in an area, indicating whether the environment was aquatic, terrestrial, or otherwise.

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What is a sedimentary rock?

Back

Sedimentary rock is a type of rock formed by the accumulation and compaction of mineral and organic particles, often containing fossils.

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What is the geological time scale?

Back

The geological time scale is a system used by geologists and paleontologists to describe the timing and relationships of events in Earth's history.

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What is the importance of fossil records?

Back

Fossil records are crucial for understanding the history of life on Earth, including the evolution of species and the changes in Earth's environments over time.

Front

What does it mean for a fossil to be 'younger'?

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A 'younger' fossil is one that was formed more recently in geological time, typically found in higher layers of sedimentary rock.