"Understanding Several Common Rocks" Rocks and Minerals PPT Courseware 3

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"Understanding Several Common Rocks" Rocks and Minerals PPT Courseware 3

Thinking: How to study rocks?

You can carve a moment with a knife.

You can use a magnifying glass to observe.

You can add a few drops of hydrochloric acid

How to test rock hardness

After breaking open the rock, carve the new section with fingernails, a copper key, and a knife;

1. After carving with fingernails, the carved rock will be softer.

2. There are no scratches after carving with fingernails, but the rocks with scratches after carving with copper keys are relatively hard.

3. There are no scratches after being carved with a copper key, but the rock that is left with scratches after being carved with a knife is very hard.

4. The rock is very hard and does not leave any marks even after carving it with a knife.

Kind tips

1. Pay attention to safety when using a knife

2. Never put hydrochloric acid on your skin or clothes.

Sandstone: Available in red, earthy yellow, gray and other colors, it looks like a lot of sand of similar thickness stuck together, rough and hard.

Granite: piebald, composed of black, white, flesh-red or colorless transparent particles. The particles are coarse, rough and very hard.

Conglomerate: Looks like concrete and is made up of gravel or pebbles and is rough and hard.

Limestone: blue-gray, gray or slightly yellow, with fine particles, smooth, hard, often fossilized, and bubbles when exposed to hydrochloric acid.

Shale: comes in various colors such as gray, black, red, brown, yellow, etc., has fine particles, is soft, is relatively smooth, is thin-layered, and often contains fossils.

Classroom meets standards

1. Fill in the blanks.

1. A simple instrument used to observe the details of objects is ( ).

2. ( ), ( ), ( ) draw on the new section of the rock to test the hardness of the rock.

3. When using hydrochloric acid to detect rocks, you must use ( ) to get the hydrochloric acid.

4. We can study the characteristics of rocks from several aspects such as ( ), ( ), ( ), ( ), etc.

5. The hardness of rock can be divided into four levels: soft, ( ), ( ), ( ), and ( ).

2. Multiple choice questions.

Fingernails carve unmarked rocks, while copper keys carve carved rocks ( ).

A softer B harder C very hard D very hard

3. Judgment questions.

1. Various rocks have different hardnesses. ( )

2. All rocks are granular. ( )

3. Some rocks bubble when exposed to hydrochloric acid, while others do not. ( )

Four, one after another.

Rocks with nicks left after being carved by fingernails are harder

The rock with the scratches left after the copper key was carved is very hard.

Rocks that are scratched with a knife are softer

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Update Time: 2024-06-29

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