bell work describe the process of recycling paper
TRANSCRIPT
Bell Work
• Describe the process of recycling paper.
Intro to Biology – Lecture 31
Conserving Resources
What does this symbol mean?
Recycling
• Processing used materials (waste) into new products
Why is Recycling Useful?
• to prevent waste of potentially useful materials
• to reduce the consumption of fresh raw materials
• to reduce energy usage• to reduce air and water pollution
Energy for Recycling
• All forms of recycling use energy in the process of putting material resources back into use.
Recycling in Ecology
• Ecosystems use the diversity of food webs to recycle natural materials, such as mineral nutrients, which includes water.
Recycling in Ecology
• Regulated during the process of decomposition
• Nutrients are broken down by decomposers and returned to the soil to be used by plants.
Ecological Recycling
• Also known as the nutrient system.• An ecosystem functions as a unit
Recycling Matter
• Matter is recycled through an ecosystem through cycles
• Different animals with different eating habits help to recycle matter (carnivores, producers, herbivores, omnivores, scavengers, and decomposers).
Law of Conservation of Matter or Mass
• Matter can neither be created nor destroyed and that nature is essentially a closed system.
Within an Ecosystem
• Matter and energy are transferred • Nutrient cycling occurs in ecosystems that
participate in large scale energy transfers throughout the system.
Recycling is Natural
• The conservation of resources is a natural, almost unnoticeable process.
• Life substances are recycled in the ecosystem
Recycling in an Ecosystem
• The nutrient cycle is nature's recycling system
The Nutrient Cycle
• A nutrient cycle is nature's way of ensuring life can carry on in the closed system called Earth.
What is a Closed System?
• Nothing is inputted or outputted from the system
Nature is a Closed System
• This means that all the elements we rely on to support life on the planet are here and have been here since the beginning.
Where Nutrients are Shared
• Biogeochemical cycles are complex ways that chemical elements and compounds move between the atmosphere, the soils (lithosphere) living organisms (biosphere) and oceans, lakes etc. (hydrosphere).
How this Relates to Recycling
• In order for life to continue, each cycle must remain in motion.
• Once a living thing has finished using a nutrient and either excretes it or drops dead, the nutrient must cycle back for some other living thing to use it.
Recycling Elements
• About 95% of the total mass of all living things are made up of six elements: hydrogen, oxygen, carbon, nitrogen, phosphorus and sulfur.
• The nutrient cycles work to keep these elements in circulation.
The Nutrient Recycling Cycles
• Each cycle has a complex variety of pathways it can take to keep the nutrient moving through the system.
The Recycling Cycles
• The water cycle (hydrogen and oxygen)• The carbon cycle• The sulfur cycle• The phosphorus cycle• The nitrogen cycle
The Two Important Cycles
• Nitrogen cycle and Phosphorus cycle are the most important to life.
• This is because the most common limiting factors for growth are inadequate nitrogen or inaccessible phosphorus.
A Form of Recycling
• Composting – keeps important nutrients in circulation
• Throwing items away in plastic bags takes those molecules out of the nutrient cycles indefinitely.