Case study of circle interaction

1. Each sphere of the earth is a place where the three states of matter exist and transform into each other.

The three-phase substances of gas, liquid and solid exist, forming systems of different sizes such as oceans, land, glaciers, deserts, lakes, rivers, swamps, etc., thus causing different scales of water, Air circulation realizes the circulation and transformation of matter and energy.

2. Each sphere of the earth is a place where internal and external forces interact.

The internal forces of the earth, such as volcanoes, earthquakes, magmatic activities, crustal uplift and subsidence, etc., have a general tendency to cause ups and downs on the surface and various surface forms. External force refers to weathering, water flow, wind erosion, etc. generated by solar radiation as the basic energy source. Through physical and chemical changes, material erosion, transportation, and accumulation, it strives to eliminate the ups and downs caused by internal forces. The general trend It is to level the surface of the earth.

3. Each sphere of the earth is a place where the organic and inorganic worlds transform into each other.

Omit details. (1) Green plants - store energy through photosynthesis - herbivores and carnivores - after the death of organisms - under the action of solar energy - decomposed into inorganic salts by microorganisms Class————for plants to reabsorb and become new organisms

(2) Green plants————Storage energy through photosynthesis————Herbivores, carnivores————organisms After death - - microorganisms cannot fully decompose - - biological residues remain underground - - after a long period of geological processes - - coal, oil, etc. - are formed - - used by people (solar energy) < /p>

4. Each circle of the earth is the place where human beings live.

The emergence of human beings has greatly changed the earth's various spheres, especially after the industrial revolution, such as: greenhouse effect, artificial landforms, heat island effect, etc.