Rock Test For 3rd Grade: Quiz!
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_____________ rocks form from PRESSURE and TEMPERATURE CHANGES.
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Sedimentary
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Metamorphic
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Igneous
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Volcanic
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About This Quiz
Explore the fascinating world of geology with our 3rd Grade Rock Test! Learn about different rock types, their formation processes, and methods to identify them See moreusing the Mohs Scale.
Questions and Answers
- 2.
What is the hardest rock?
Explanation
Diamond is considered the hardest rock because it has a Mohs hardness scale rating of 10, which is the highest possible rating. The hardness of a mineral is determined by its ability to resist scratching and diamond is known for its exceptional hardness. It is composed of carbon atoms arranged in a crystal lattice structure, making it extremely strong and durable. Diamond is often used in industrial applications such as cutting, grinding, and drilling due to its hardness.Rate this question:
- 3.
A _____________ rock forms with wind and water breaking the rock into bits. Then the wind and water carry the bits of rock and soil away. The bits settle into layers. After a long time, the layers harden into this kind of rock.
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Igneous
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Sedimentary
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Metamorphic
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Diamond
Correct Answer
A. SedimentaryExplanation
Sedimentary rock forms when weathering and erosion break down existing rocks into smaller particles. These particles are then transported by wind or water and eventually settle in layers. Over time, these layers become compacted and cemented together, forming sedimentary rock. This process can take a long time, but eventually, the layers harden and become solid sedimentary rock.Rate this question:
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- 4.
This kind of rock was melted then cooled and hardened. Some cooled quickly and others more slowly.
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Sedimentary
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Igneous
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Metamorphic
Correct Answer
A. IgneousExplanation
Igneous rocks are formed when molten rock, called magma, cools and solidifies. This process can occur either underground or on the Earth's surface. Igneous rocks can be formed from the rapid cooling of magma, which results in fine-grained rocks, or from the slow cooling of magma, which results in coarse-grained rocks. Therefore, the description of the rock being melted, cooled, and hardened suggests that it is an igneous rock.Rate this question:
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- 5.
A rock is naturally formed from ______________________.
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Sediments
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One or more minerals.
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Diamonds
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Crystals
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Pressure and temperature changes.
Correct Answer
A. One or more minerals.Explanation
A rock is naturally formed from one or more minerals. Rocks are composed of minerals, which are naturally occurring inorganic substances with a specific chemical composition and crystal structure. Rocks can be made up of a single mineral or a combination of different minerals. The minerals in rocks are formed through various geological processes such as cooling and solidification of molten lava or magma, precipitation from solution, or deposition of sediments. Therefore, the correct answer is one or more minerals.Rate this question:
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- 6.
How do you identify rocks?
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Color
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Shape
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Mohs Scale
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All of the above
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Only A and C.
Correct Answer
A. Only A and C.Explanation
The correct answer is "Only A and C." This means that to identify rocks, you can use color and the Mohs Scale. Color can be an indicator of the composition of the rock, while the Mohs Scale is used to determine the hardness of a mineral, which can help in identifying the type of rock. Shape is not mentioned as a method for identifying rocks in this question.Rate this question:
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- 7.
The Mohs Scale identifies the rock by testing the ___________.
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Shape
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Color
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Hardness
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Softness
Correct Answer
A. HardnessExplanation
The Mohs Scale is used to identify rocks by testing their hardness. Hardness refers to the ability of a material to resist scratching or abrasion. The scale assigns a numerical value to different minerals based on their hardness, with diamond being the hardest mineral at the top of the scale. By testing the hardness of a rock, one can determine its place on the Mohs Scale and identify it accordingly.Rate this question:
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- 8.
What is a trace or remains of a living thing that died long ago?
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A grave
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A diamond
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A fossil
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A mineral
Correct Answer
A. A fossilExplanation
A fossil is the trace or remains of a living thing that died long ago. Fossils are typically preserved in rocks or sediments and provide important evidence of past life on Earth. They can include the preserved bones, teeth, shells, or imprints of ancient organisms. Fossils help scientists understand the history of life on our planet and how different species have evolved over time.Rate this question:
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- 9.
Fossils are found in what type of rock? Metamorphic or Igneous or Sedimentary.
Correct Answer
sedimentary rock., sedimentaryExplanation
Fossils are typically found in sedimentary rock. Sedimentary rocks are formed from layers of sediment that accumulate over time and eventually harden into rock. Fossils are often preserved in sedimentary rock because the layers can trap and preserve organic remains, such as bones or shells, within them. This is why sedimentary rock is the most common type of rock where fossils are found.Rate this question:
- 10.
Choose the answer that is NOT the reason why plant fossils are not as common as animal fossils.
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Soft parts of plants are easily destroyed as the rock forms.
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Animals have bones, plants have soft parts.
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Plants have hard parts.
Correct Answer
A. Plants have hard parts.Explanation
Plants having hard parts is not the reason why plant fossils are not as common as animal fossils. The correct answer is that the soft parts of plants are easily destroyed as the rock forms. This is because soft tissues like leaves, stems, and flowers decompose quickly, leaving behind only the harder parts like wood or seeds that can fossilize. Animal fossils, on the other hand, are often preserved in sediments or trapped in amber, which can protect their soft tissues from decay.Rate this question:
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Nov 11, 2024Quiz Edited by
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Mar 16, 2009Quiz Created by
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