Rock Subtraction

Front

What is hardness in rocks?

Back

Hardness measures a rock's resistance to scratching, assessed using the Mohs scale from 1 (talc) to 10 (diamond).

Front

How many rocks have a hardness lower than 10 if you have 215 rocks and 38 are rated 10?

Back

177 rocks have a hardness lower than 10.

Front

What determines the color of rocks?

Back

The color of rocks is determined by their mineral composition, ranging from vibrant hues to subdued shades.

Front

If you have 564 vibrant rocks and 187 are blue, how many are not blue?

Back

377 rocks are not blue.

Front

What does the texture of a rock refer to?

Back

Texture refers to the feel and appearance of a rock's surface, which can be rough, smooth, grainy, or bumpy.

Front

If you find 736 rocks and 352 have a rough texture, how many do not have a rough texture?

Back

384 rocks do not have a rough texture.

Front

What is luster in rocks?

Back

Luster describes how a rock reflects light; shiny luster is glossy, while dull luster is matte.

Front

If you have 482 rocks and 215 have shiny luster, how many have dull luster?

Back

267 rocks have dull luster.

Front

What is the Mohs scale used for?

Back

The Mohs scale is used to rank the hardness of minerals from 1 to 10.

Front

Give an example of a rock with a hardness of 10.

Back

Diamond is an example of a rock with a hardness of 10.