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6th grade Science Unit 3 Pretest — 20 Questions
Armstrong, Kennedee

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Stones for Building: Marble and Granite
Read the passage and answer the following question(s).

Stones for Building: Marble and Granite

Marble and granite are both types of rock commonly used for buildings and sculptures. Each type of rock has its own history and characteristics.

Marble is a pale, fine-grained (smooth) metamorphic rock. The materials that make up marble come from the shells of sea creatures. These shells fall to the bottom of the ocean and are broken apart into tiny pieces. Over time, the pieces stick together to form limestone. Limestone that undergoes heat or pressure may eventually change into marble. Marble is composed mostly of a mineral called calcite. Although it is a very durable material, it can be damaged by acidic rain.



Granite is a multi-colored stone, made up of large different-colored grains. Granite is made up of shale and sandstone that has melted and cooled under Earth’s surface. It can contain many different minerals, including quartz and feldspar. Granite can be damaged by water, collisions with other sharp objects, or pollution. Over time, this damage can cause small pieces of the rock to flake off.



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Question 16.



Which statement best describes how limestone is changed into marble?


Heat and pressure changes the characteristics of limestone.


Heat and pressure cause small pieces of rock to stick together.


Flowing water breaks off the rough edges of the rock surface.


Acidic water dissolves limestone into its component parts.

Question 17.



Students have samples of calcite and marble. They want to determine how the traits of calcite contribute to the traits of marble. Which investigation will best help them answer their question?


by using a hand lens to examine the arrangement of crystals in marble


by crushing a sample of marble and examining the fragments


by pouring acid on a sample of calcite and observing whether any damage occurs


by observing the changes that occur when the sample of calcite is heated

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GPT-5 mini
Question 16: Heat and pressure changes the characteristics of limestone.

- Passage says limestone that undergoes heat or pressure may change into marble.

Question 17: by pouring acid on a sample of calcite and observing whether any damage occurs.

- Marble is mostly calcite and the acid test shows a key calcite trait (reactivity to acid) that explains why marble is damaged by acidic rain.

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