Question

The four main systems of the earth are

Answer 1

The four main systems of the earth are the geosphere, the hydrosphere, the atmosphere, and the biosphere .

Answer 2

The four main systems of the Earth are:
1. Geosphere - incldues the crust (continents, the ocean floor and entire Earth's surface)and the mantle (the inner layer of the Earth)
2. Hydrosphere - includes all water on the Earth (rivers, lakes, streams, oceans, groundwater, polar ice caps, glaciers and moisture in the air-rain and snow)
3. Atmosphere - includes the gasses, commonly known as air, that surrounds the planet Earth
4. Biosphere - includes living organisms (microorganisms, plants and animals)on the planet.