Fossils Flashcard for Grade 6

Front

Fossils help scientists understand Earth's history by:

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Providing evidence of past life forms.

Answer explanation

Fossils provide evidence of past life forms, allowing scientists to study the types of organisms that existed, their evolution, and how they interacted with their environment, which is crucial for understanding Earth's history.

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Fossilization process:

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Organisms are buried, decompose, and leave an impression.

Answer explanation

The correct choice describes fossilization accurately: organisms are buried, decompose over time, and leave behind impressions or traces, which can become fossils. The other options do not represent the fossilization process.

Front

Type of fossil formed when minerals replace an organism?

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Petrified fossil

Answer explanation

A petrified fossil forms when minerals replace all or part of an organism, turning it into stone. This process preserves the original structure, unlike mold or impression fossils, which do not involve mineral replacement.

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Fossil

Back

Remains or traces of ancient life

Answer explanation

A fossil is defined as the remains or traces of ancient life, such as bones, shells, or imprints. This distinguishes it from rocks, minerals, or plants, making the correct choice clear.

Front

First step in fossil formation?

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Sedimentation

Answer explanation

The first step in fossil formation is sedimentation, where layers of sediment accumulate over time, covering organic material. This process is crucial as it protects the remains from erosion and decomposition, allowing fossilization to occur.

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Type of fossil:

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Mold fossil

Answer explanation

A mold fossil is a type of fossil formed when an organism leaves an impression in sediment, which later hardens. In contrast, igneous, sedimentary, and metamorphic rocks are types of rock, not fossils.

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Trace fossil:

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Evidence of an organism's activity.

Answer explanation

A trace fossil is not a complete organism but rather shows evidence of an organism's activity, such as footprints or burrows, making the second choice the correct answer.

Front

Process of sediment solidification into rock, preserving fossils.

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Lithification

Answer explanation

The process of lithification involves the compaction and cementation of sediments, transforming them into solid rock. This process can preserve fossils within the rock, making lithification the correct answer.

Front

Types of fossils: Trace, Mold, Igneous.

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Igneous fossil

Answer explanation

The correct answer is 'Igneous fossil' because it is not a recognized type of fossil. Fossils are typically classified as trace fossils, mold fossils, or cast fossils, but not igneous.