| Category | Format | Size |
|---|---|---|
| Fourth Grade Science Volume 2, Textbook Edition | pptx | 6 MB |
"The Composition of Rocks" Rocks and Minerals PPT Courseware 3
Description
"The Composition of Rocks" Rocks and Minerals PPT Courseware 3
rock formation
1. Magma is generated deep in the ground.
2. There is a large amount of magma beneath the earth's crust.
3. Magma can rise to the ground.
4. Volcanic activity generally occurs at or near the intersection of tectonic plates.
Types of volcanoes
active volcano
Underground magma chambers exist and are active.
dormant volcano
The underground magma chamber exists but is currently inactive.
extinct volcano
The underground magma chamber no longer exists.
Extrusive rock (basalt)
Most of the oceanic crust is composed of basalt, some of which are dense and some of which are porous. Basalt is weathered to form clay or laterite.
Plutonic rock (granite)
Granite intrudes deeper into the earth's crust, so the magma cools slowly, so the minerals in the magma have enough time to grow slowly and form coarse-grained minerals.
conglomerate
Features: The color is mostly gray and blue-grey. The particle size is larger than about 2 mm.
sandstone
Features: There are many color changes, ranging from white to blue-grey. There are bright
The grains are obvious and rough to the touch. The structure is dense and hard.
1. What force makes sand hard?
2. How are the layers of rock formed?
3. Why do traces of trilobites, shells, and fish appear on rocks?
4. Is the formation of rocks related to crustal movement?
type of rock
igneous rock
Rocks formed when magma flows from the depths of the earth through volcanic eruptions and cools are called igneous rocks. Such as: granite or basalt
sedimentary rock
Some rocks are made of stone fragments, animal bones, etc., and the rocks gradually formed after millions of years of accumulation are called sedimentary rocks. Such as: sandstone, shale, limestone, etc.
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For more information about the "Rocks and Minerals Composition of Rocks" PPT courseware, please click on the "Rocks and Minerals ppt Composition of Rocks ppt" tag.
"Composition of Rocks" Rocks and Minerals PPT Download:
"The Composition of Rocks" Rocks and Minerals PPT Download Part One Content: New Knowledge Explanation Beautiful Granite Granite is a rock formed by the magma deep in the earth's crust that cools and hardens before it reaches the surface when it penetrates upward along the cracks in the earth's crust. So granite...
"The Composition of Rocks" Rocks and Minerals PPT:
"The Composition of Rocks" Rocks and Minerals PPT Part 1 Content: Beautiful Granite Use a magnifying glass to carefully observe the granite and see what kinds of particles make up the granite? What are they? Although granite comes in a variety of colors, they...
"The Composition of Rocks" Rocks and Minerals PPT Courseware 2:
"The Composition of Rocks" Rocks and Minerals PPT Courseware 2 Beautiful Granite 1. Granite Granite is a kind of structural rock that is lava from volcanic eruptions and is raised to the surface of the earth's crust in a molten state under considerable pressure. As the surface of the Earth's crust forms, slowly moving and cooling...
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Update Time: 2024-06-26
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