BIOGEOCHEMICAL CYCLES

REPORTED BY:

MS. EMYLIE A. LANTORIA

BIOGEOCHEMICAL CYCLE-also called substance turnover or cycling substance-is a pathway by which chemical substance moves through biotic and abiotic compartments of the earth.

3 CYCLESWater CycleCarbon CycleOxygen Cycle

Cycle-it is a series of change which comes back to the starting point and which can be repeated.

WATER CYCLE(H20 cycle)

WATER CYCLE-also known as hydrological cycle or the H20 cycle.-describes the continuous movement of water on, above and below the surface of the earth.

WATER CYCLE consist of:

Evaporation and Transpiration

Condensation Precipitation Run0ff

Drives the water cycle

-heats water, oceans and seas.

EVAPORATION TRANSPIRATION

both cause by the sun

EVAPORATION-the transformation of water from liquid to gas phases as it moves from the ground or bodies of water into the overlying atmosphereSun

heats up water

TRANSPIRATION-the release of water vapor from plants and soil into the air.

CONDENSATION-the transformation of water vapor to liquid water droplets in the air, creating clouds and fog.

PRECIPITATION-condensed water vapor that falls to the earth surface.

-occurs as rain, snow, hail, fog drip, graupel and sleet

Surface Runoff-variety of ways by which water moves across the land.

When rain falls into the land, some of the water is absorbed into the ground forming pockets of water called Groundwater. Most ground eventually returns to the ocean. Others run directly into the streams of river. Waters collect in the rivers, streams, and ocean is called runoff.

“water never leaves from the earth, it repeat it’s cycle again and again.”

CARBON-OXYGEN CYCLE

CO2 02

The Carbon Dioxide and Oxygen CycleThe carbon-Oxygen Cycle is interconnected

and involves three major processes and one minor process:1. Photosynthesis2. Respiration3. Combustion4. Decomposition

PHOTOSYNTHESISPlants take in carbon dioxide (CO2) and water with the help of their roots. The chlorophyll present in the leaves and the energy from the sun, helps convert CO2 and H20 into Oxygen (O2), sugar and water vapor. Oxygen released by the plants as a by-product into the atmosphere

Chemical formula for Photosynthesis

RESPIRATIONRESPIRATION occurs when animals and humans take in oxygen from the air along with simple sugars from the food.

This help in release of carbon dioxide, water and energy from animal body. During cellular respiration, animals and human requires oxygen while inhalation. When they exhale the waste product of Cellular Respiration, they release CO2 into the atmosphere again

PHOTOSYNTHESIS AND CELLULAR RESPIRATION

How they are connected?

COMBUSTIONIt is a process of burning that occurs naturally in the

nature. When combustion occurs CO2 is released into the atmosphere.

Example:Volcanic eruption are natural combustion processes where CO2 is released into the atmosphere due to burning.

Most pollution problems occur because cars and factories release CO2 by their burning fossil fuels

CARFACTORY

DECOMPOSITION-decomposition is when organic matter breaks down chemically into all simple elements that they are made of and these elements return back to the environment.

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