María Jesús Camposlearningfromgeography.wikispaces.com
The Layers of the EarthThe Earh has three layers: The crust: a solid outer part of the Earht’s surface. It represents around a 1% of the Earth. The mantle: it is located under the crust. It represents an 84% of the Earth. It is formed by some solid materials but mainly by melted rocks that forms the magma. The core: it is the inner part of the Earth. It represents a 15% of the Earth. It has two parts: the inner core which is extermely hot but solid as its materials are under high pressures and the outer core also very hot but formed by melted materials.
The Earth’s SurfaceTo make investigationseasier the surface of theEarth has been dividedup into four interconectedspheres: Lithosphere Hydrosphere Atmosphere Biosphere
LITHOSPHERE It comes from the ancient Greek “lithos”, stone, and “sphaira”, sphere. It refers to the rocky crust that covers the Earth.
HYDROSPHERE It comes from the ancient Greek “hydro” which means water and “sphaira” which means sphere. It refers to water on, under and over the surface of the Earth.
ATMOSPHERE It comes from the ancient Greek “atmo” which means air and “sphaira” which means sphere. It refers to the body of air which surrounds the Earth. These layers of gases are retained by the Earth’s gravity.
BIOSPHERE It comes from the ancient Greek “bio” which means life and “sphaira” which means sphere. It is formed by all living organisms: animals, plants and microbes. It is the global sum of the ecosystems. An ecosystem is a community of living organisms interacting with their environment (air, water, soil…)
It is the branch of Geography that focuses on the study of the activities that take place in the lithosphere, the hydrosphere, the atmosphere and the biosphere of the Earth.
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