Classifying Rocks by Hardness

Front

Which tool would you use to test the hardness of a rock on the Moh's Scale? Options: A ruler, A penny, A magnifying glass, A thermometer

Back

A penny

Front

Classify a rock that can be scratched by a fingernail but not by a penny.

Back

Soft

Front

If a rock has a shiny surface, what term describes its luster?

Back

Glassy/Shiny

Front

A student finds a rock that is black and shiny. Which type of rock is it most likely to be?

Back

Obsidian

Front

What simple test can you perform to determine the texture of a rock?

Back

Feel it

Front

Which rock is likely to be harder: one that scratches glass or one that is scratched by a penny?

Back

The rock that scratches glass

Front

What is the main purpose of using a steel nail in rock testing?

Back

To test the hardness

Front

If a rock is easily scratched by a steel nail, what can you infer about its hardness?

Back

It is soft

Front

What is the term used to describe how a rock feels to the touch?

Back

Texture

Front

If a rock cannot be scratched by a fingernail but can be scratched by a penny, what is its approximate hardness on the Moh's Scale?

Back

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