The
four earth spheres
The area near the surface of the
earth can be divided up into four inter-connected geospheres, the lithosphere,
hydrosphere, biosphere, and atmosphere. Scientists can classify life and
material on or near the surface of the earth to be in any of these four
spheres.
- stone (litho),
- air (atmo),
- water (hydro), and
- life (bio).
Lithosphere
The Earth's hard, outermost shell.
It comprises the crust and the upper part of the mantle. It is divided into a
mosaic of 16 major plates. This crust is inorganic and is composed of
minerals. It covers the entire surface of the earth from the top of Mount
Everest to the bottom of the Mariana Trench.
Hydrosphere
The hydrosphere is composed of all of the water on or near the earth.
Hydrosphere
The hydrosphere is composed of all of the water on or near the earth.
The water that covers 71 percent of
the Earth's surface as oceans, lakes, rivers, and streams. The hydrosphere also
includes ground water, water that circulates below the Earth's surface in the
upper part of the lithosphere. Ninety-seven percent of the earth's water
is in the oceans. The remaining three percent is fresh water; three-quarters of
the fresh water is solid and exists in ice sheets
Biosphere
The biosphere is composed of all living organisms.
Biosphere
The biosphere is composed of all living organisms.
Biosphere is a total of plant life,
animal life and all other factors that make up the earth. Plants, animals,
and one-celled organisms are all part of the biosphere. Most of the planet's
life is found from three meters below the ground to thirty meters above it and
in the top 200 meters of the oceans and seas.
Biosphere is the sum total of the ecosystems present in the world. In other words, biosphere is a global integration of all living beings, their interactions, interdependence and relationships.
Atmosphere
The atmosphere is the body of air which surrounds our planet.
Biosphere is the sum total of the ecosystems present in the world. In other words, biosphere is a global integration of all living beings, their interactions, interdependence and relationships.
Atmosphere
The atmosphere is the body of air which surrounds our planet.
The air of our planet is 79%
nitrogen and just under 21% oxygen; the small amount remaining is composed of
carbon dioxide and other gases. The atmosphere is the cover of air that
stretches up to six hundred miles above the earth. If an aero planes passes out
of this cover, it will be able to reach any planet without any difficulty,
because gravitation does not exert its pull beyond this hemisphere
Additionally, there will be elements
of the hydrosphere present as moisture within the soil, the biosphere as
insects and plants, and even the atmosphere as pockets of air between soil
pieces
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