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Qingdao edition third grade science volume 2, types of soil PPT
Part One: Soil
What is soil?
Soil is composed of three types of substances: solid, liquid and gas. Solid matter includes soil minerals, organic matter and microorganisms. Liquid material mainly refers to soil moisture. Gas is the air present in the pores of the soil.
Soil formation:
Rocks are weathered and broken, and their physical and chemical properties are changed, forming a loose weathering crust, the upper part of which can be called soil parent material. If the weathering crust remains in place and forms residual material, it is called residual parent material.
Good soil:
Refers to soil with moderate amounts of clay, silt, and sand in its particle composition. The texture is between clay and sand, and it has the advantages of both clay and sand. It is a soil with good air permeability, water retention and heat preservation properties.
Types of soil PPT, part 2: soil hazards
1. In arid, semi-arid and semi-humid areas, the process of destroying the ecological balance, land degradation, reducing land production potential, and even turning into a desert-like landscape due to various factors such as climate change and human activities is called land desertification. .
2. Land salinization is a serious environmental problem existing in land use in arid and semi-arid areas around the world. People generally refer to soils whose surface layer contains more than 0.6%-2% of easily soluble salts as saline soil. When soil salinization is severe, it is difficult for ordinary plants to survive, and the land becomes barren.
Small experiment:
Demonstration experiment: Take 3 plastic bottles with the bottoms removed, wrap fine gauze around the bottle mouths, tie them tightly with thread, and put the same amount of sandy soil, clay soil, and loam into the 3 bottles respectively; put the 3 bottles Place it on the stand, take three glasses of the same size and place them under the mouths of the three bottles; pour the same amount of water into the three bottles at the same time.
Keywords: Qingdao edition third grade science PPT courseware for the second volume free download, types of soil PPT download, .PPT format;
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"Types of Soil" PPT download:
Qingdao edition third grade science volume 2, types of soil PPT download, the first part content: Knowledge exploration Exploration 1: Types of soil What are the differences between the four soils on the table? ① Twist their viscosity with your hands. ②Pinch them with your hands to see if they can be kneaded into a ball. ③..
"Types of Soil" PPT courseware:
Qingdao edition third grade science volume 2, types of soil PPT courseware, the first part of the content: Classification of soil Soil refers to the soil on the ground that can grow plants. What types of soil are there? (1) Sandy soil? (2) Clay soil? (3) Loam? Explore, ask questions, soil...
"Types of Soil" Soil PPT Courseware 4:
"Types of Soil" Soil PPT Courseware 4 Types and Characteristics of Soil Sandy soil: coarser particles Clay soil: finer particles Loam soil: a mixture of coarse-grained sand and fine-grained clay Types of soil: sandy soil, clay Soil, loam... How to identify soil...