Describe the four main spheres of earth. 1. lithosphere: 2. hydrosphere: 3. atmosphere: 4. biosphere:

The four main spheres of Earth are as follows:  

1. Lithosphere: It is also called geosphere and is formed of the core of the Earth, the crust, mantle, ocean floor, sand, mountains, asphalt, rocks, and others.  

2. Hydrosphere: It is formed of everything that comprises water like rivers, oceans, lakes, rain, snow, and ice caps.  

3. Atmosphere: It is formed of gases like hydrogen, oxygen, water vapor, the wind, and the ozone.  

4. Biosphere: It comprises all the living components like animals, plants, humans, microbes, insects, and others.  

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the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.