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Biogeochemical Cycles

The document summarizes three biogeochemical cycles: The water cycle describes how water moves between the Earth's atmosphere, land, and oceans through evaporation, condensation, precipitation, and runoff. The nitrogen cycle involves the conversion of nitrogen between its various chemical forms as it cycles between the atmosphere, terrestrial ecosystems, and marine ecosystems. The carbon cycle describes how carbon is exchanged between the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere through various natural processes.

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Namish SN
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211 views8 pages

Biogeochemical Cycles

The document summarizes three biogeochemical cycles: The water cycle describes how water moves between the Earth's atmosphere, land, and oceans through evaporation, condensation, precipitation, and runoff. The nitrogen cycle involves the conversion of nitrogen between its various chemical forms as it cycles between the atmosphere, terrestrial ecosystems, and marine ecosystems. The carbon cycle describes how carbon is exchanged between the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere through various natural processes.

Uploaded by

Namish SN
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as PDF, TXT or read online on Scribd
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BIOGEOCHEMICAL

CYCLE
Presented by Group 4
What are Biogeochemical cycles?
The term biogeochemical is derived from “bio” meaning biosphere, “geo” meaning the
geological components and “chemical” meaning the elements that move through a cycle.
A constant interaction between the biotic and abiotic components of the biosphere makes it a
dynamic, but stable system. These interactions consist of a transfer of matter and energy
beteen the different components of the biosphere.
Water Cycle
TOPICS
the water cycle or hydrologic
cycle describes the complex
systems that allow water to move
across the Earth and atmosphere.
Nitrogen Cycle
The nitrogen cycle is the
biogeochemical cycle by which
nitrogen is converted into
multiple chemical forms as it
circulates among atmosphere,
terrestrial, and marine
ecosystems. Carbon Cycle

The carbon cycle is the


biogeochemical cycle by which
carbon is exchanged among the
biosphere, pedosphere, geosphere,
hydrosphere, and atmosphere of
the Earth.
Water Cycle
Water Cycle
INTRODUCTION
The whole process in which water evaporates and
falls on the land as as rain and later flows back into
the sea via rivers in known as Water cycle.
All of the water that falls on the land doesn't
immediately flow back into the sea some of it seeps
into the soil and becomes part of the underground
reservoir of fresh water and some of the
underground water comes to the surface through
springs.
Water flows through or over rocks containing
soluble minerals some of them get dissolved in the
water. thus rivers carry many nutrients from the
land to the sea and these are used by marine
organisms.
Water Cycle
STAGES OF WATER CYCLE
1.Evaporation
generally happens when water molecules at the surface of
water bodies become excited and rise into the air. These
molecules with the highest kinetic energy accumulate into
water vapour clouds
2.Sublimation
Sublimation occurs when snow or ice changes directly
into water vapour without becoming water. It usually
occurs as a result of dry winds and low humidity.
3.Condensation
The water vapour that accumulated in the atmosphere
eventually cools down due to the low temperatures found
at high altitudes. These vapours become tiny droplets of
water and ice, eventually coming together to form clouds.
Water Cycle
STAGES OF WATER CYCLE
4.Precipitation
Above 0 degrees centigrade, the vapours will condense
into water droplets.When enough droplets merge, it falls out
of the clouds and on to the ground below. This process is
called precipitation (or rainfall).
5.infiltration
Rainwater gets absorbed into the ground through the
process of infiltration.
6.Runoff
If the water from rainfall does not form aquifers, it follows
gravity, often flowing down the sides of mountains and hills;
eventually forming rivers. This process is called runoff.
NITROGEN CYCLE

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