"Various Rocks" Rocks and Minerals PPT Courseware 2

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"Various Rocks" Rocks and Minerals PPT Courseware 2

Rocks are the main component of the Earth and can be found everywhere.

Where have you usually seen rocks?

Rocks are aggregates formed by geological processes, composed of one or more minerals, and have a certain structure. A few of them also contain the remains or remains of living things (i.e. fossils).

Rocks have three states: solid, gas (such as natural gas), and liquid (such as gasoline), with solid being the most common.

1. Where do my rocks come from?

Where were the rocks found? Please briefly describe your search experience.

Students can first communicate in groups and then report to the whole class.

Classify rocks

1. Think about what criteria you would use to classify rocks.

Can these rocks be classified?

If you were asked to classify these rocks, how would you classify them? Why is it divided like this?

Exchange of rock classification results.

How do you classify rocks? How are they divided?

How many different classification methods have you come up with? Do different classification methods have the same results?

Each group took out the first set of rocks to study. (Select sedimentary rock type)

Look closely at this group of rocks. After the students observe, report the results. (Internal structure and characteristics of rocks, etc.)

How could they be like this?

Maybe it has something to do with their origin?

Maybe it has something to do with their formation?

Sedimentary rocks mainly include limestone, sandstone, shale, etc.

Compared with igneous rocks and metamorphic rocks, fossils in sedimentary rocks are less damaged and easier to preserve intact, so they are very important research targets for archaeology.

Common magmatic rocks include granite, andesite and basalt. Generally speaking, igneous rocks tend to appear in volcanic areas at the junction of plates.

Granite has a uniform structure and a hard texture.

Granite is not easily weathered, has a beautiful color, and can maintain its appearance for more than a hundred years. Due to its high hardness and wear resistance, in addition to being used in high-end architectural decoration projects and hall floors, it is also the preferred material for open-air carvings.

Research on pumice, marble and other rocks

observe. Take a closer look at pumice and granite. What are the special features of these rocks?

Speculation. Why are they said to have special properties? Let us speculate, what might this be related to?

Simulation experiments of volcanic eruptions. What did you discover and what inspiration did you get from the experiment?

explain. Now can you explain the causes of the formation of these types of rocks based on experimental phenomena and comparison with observation results?

How to understand rocks

First look: Look at the color, look at the gloss, look at the transparency, look at the shape

Second touch: smoothness

Three strokes: scratches

Four drops: Drop hydrochloric acid and observe the bubbles.

Observe the luster of minerals

1. Observe the luster of minerals.

(1) Observe the light transmission and emission of glass

(2) Observe the light transmission and reflection of different objects.

Use the method of observing glass to observe and study the light transmission and reflection of bricks, soil, copper sheets, silk and other objects.

(3) Observe the light transmission and reflection of minerals

Please carefully observe the light transmission and reflection of quartz, feldspar and mica.

Please accurately describe the light transmission and reflection of these three minerals.

2. Observe the softness and hardness of minerals.

(1) Compare the softness and hardness of copper sheets, iron sheets and aluminum sheets.

What phenomenon did you discover when you scratched each other with a copper sheet and an iron sheet?

(2) Compare the softness and hardness of minerals.

3. Observe mineral streaks.

Observe the pencil streaks.

Use a pencil to draw a scratch on a white porcelain plate. What do you find?

Is there a difference between the color of pencil marks and the color of the pen tip?

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Update Time: 2024-09-30

This template belongs to science courseware Fourth Grade Science Volume 2, Textbook Edition industry PPT template

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